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{{task}}
The task is to strip control codes and extended characters from a string. The solution should demonstrate how to achieve each of the following results:
- a string with control codes stripped (but extended characters not stripped)
- a string with control codes and extended characters stripped
In ASCII, the control codes have decimal codes 0 through to 31 and 127. On an ASCII based system, if the control codes are stripped, the resultant string would have all of its characters within the range of 32 to 126 decimal on the ASCII table.
On a non-ASCII based system, we consider characters that do not have a corresponding glyph on the ASCII table (within the ASCII range of 32 to 126 decimal) to be an extended character for the purpose of this task.
Ada
with Ada.Text_IO;
procedure Strip_ASCII is
Full: String := 'a' & Character'Val(11) & 'b' & Character'Val(166) &
'c' & Character'Val(127) & Character'Val(203) &
Character'Val(202) & "de";
-- 5 ordinary characters ('a' .. 'e')
-- 2 control characters (11, 127); note that 11 is the "vertical tab"
-- 3 extended characters (166, 203, 202)
function Filter(S: String;
From: Character := ' ';
To: Character := Character'Val(126);
Above: Character := Character'Val(127)) return String is
begin
if S'Length = 0 then
return "";
elsif (S(S'First) >= From and then S(S'First) <= To) or else S(S'First) > Above then
return S(S'First) & Filter(S(S'First+1 .. S'Last), From, To, Above);
else
return Filter(S(S'First+1 .. S'Last), From, To, Above);
end if;
end Filter;
procedure Put_Line(Text, S: String) is
begin
Ada.Text_IO.Put_Line(Text & " """ & S & """, Length:" & Integer'Image(S'Length));
end Put_Line;
begin
Put_Line("The full string :", Full);
Put_Line("No Control Chars:", Filter(Full)); -- default values for From, To, and Above
Put_Line("Neither_Extended:", Filter(Full, Above => Character'Last)); -- defaults for From and To
end Strip_ASCII;
Output:
The full string : "a
b�c��de", Length: 10
No Control Chars: "ab�c��de", Length: 8
Neither_Extended: "abcde", Length: 5
ALGOL 68
# remove control characters and optionally extended characters from the string text #
# assums ASCII is the character set #
PROC strip characters = ( STRING text, BOOL strip extended )STRING:
BEGIN
# we build the result in a []CHAR and convert back to a string at the end #
INT text start = LWB text;
INT text max = UPB text;
[ text start : text max ]CHAR result;
INT result pos := text start;
FOR text pos FROM text start TO text max DO
INT ch := ABS text[ text pos ];
IF ( ch >= 0 AND ch <= 31 ) OR ch = 127 THEN
# control character #
SKIP
ELIF strip extended AND ( ch > 126 OR ch < 0 ) THEN
# extened character and we don't want them #
SKIP
ELSE
# include this character #
result[ result pos ] := REPR ch;
result pos +:= 1
FI
OD;
result[ text start : result pos - 1 ]
END # strip characters # ;
# test the control/extended character stripping procedure #
STRING t = REPR 2 + "abc" + REPR 10 + REPR 160 + "def~" + REPR 127 + REPR 10 + REPR 150 + REPR 152 + "!";
print( ( "<<" + t + ">> - without control characters: <<" + strip characters( t, FALSE ) + ">>", newline ) );
print( ( "<<" + t + ">> - without control or extended characters: <<" + strip characters( t, TRUE ) + ">>", newline ) )
{{out}}
<<�abc
ádef~
ûÿ!>> - without control characters: <<abcádef~ûÿ!>>
<<�abc
ádef~
ûÿ!>> - without control or extended characters: <<abcdef~!>>
AutoHotkey
{{trans|Python}}
Stripped(x){
Loop Parse, x
if Asc(A_LoopField) > 31 and Asc(A_LoopField) < 128
r .= A_LoopField
return r
}
MsgBox % stripped("`ba" Chr(00) "b`n`rc`fd" Chr(0xc3))
AWK
# syntax: GAWK -f STRIP_CONTROL_CODES_AND_EXTENDED_CHARACTERS.AWK
BEGIN {
s = "ab\xA2\x09z" # a b cent tab z
printf("original string: %s (length %d)\n",s,length(s))
gsub(/[\x00-\x1F\x7F]/,"",s); printf("control characters stripped: %s (length %d)\n",s,length(s))
gsub(/[\x80-\xFF]/,"",s); printf("control and extended stripped: %s (length %d)\n",s,length(s))
exit(0)
}
output:
original string: ab¢ z (length 5)
control characters stripped: ab¢z (length 4)
control and extended stripped: abz (length 3)
BASIC
{{works with|QBasic}}
While DOS does support ''some'' extended characters, they aren't entirely standardized, and shouldn't be relied upon.
DECLARE FUNCTION strip$ (what AS STRING)
DECLARE FUNCTION strip2$ (what AS STRING)
DIM x AS STRING, y AS STRING, z AS STRING
' tab c+cedilla eof
x = CHR$(9) + "Fran" + CHR$(135) + "ais" + CHR$(26)
y = strip(x)
z = strip2(x)
PRINT "x:"; x
PRINT "y:"; y
PRINT "z:"; z
FUNCTION strip$ (what AS STRING)
DIM outP AS STRING, L0 AS INTEGER, tmp AS STRING
FOR L0 = 1 TO LEN(what)
tmp = MID$(what, L0, 1)
SELECT CASE ASC(tmp)
CASE 32 TO 126
outP = outP + tmp
END SELECT
NEXT
strip$ = outP
END FUNCTION
FUNCTION strip2$ (what AS STRING)
DIM outP AS STRING, L1 AS INTEGER, tmp AS STRING
FOR L1 = 1 TO LEN(what)
tmp = MID$(what, L1, 1)
SELECT CASE ASC(tmp)
'normal accented various greek, math, etc.
CASE 32 TO 126, 128 TO 168, 171 TO 175, 224 TO 253
outP = outP + tmp
END SELECT
NEXT
strip2$ = outP
END FUNCTION
Output:
x: Français→
y:Franais
z:Français
See also: [[#Liberty BASIC|Liberty BASIC]], [[#PureBasic|PureBasic]], [[#Run BASIC|Run BASIC]]
BBC BASIC
test$ = CHR$(9) + "Fran" + CHR$(231) + "ais." + CHR$(127)
PRINT "Original ISO-8859-1 string: " test$ " (length " ; LEN(test$) ")"
test$ = FNstripcontrol(test$)
PRINT "Control characters stripped: " test$ " (length " ; LEN(test$) ")"
test$ = FNstripextended(test$)
PRINT "Control & extended stripped: " test$ " (length " ; LEN(test$) ")"
END
DEF FNstripcontrol(A$) : REM CHR$(127) is a 'control' code
LOCAL I%
WHILE I%<LEN(A$)
I% += 1
IF ASCMID$(A$,I%)<32 OR ASCMID$(A$,I%)=127 THEN
A$ = LEFT$(A$,I%-1) + MID$(A$,I%+1)
ENDIF
ENDWHILE
= A$
DEF FNstripextended(A$)
LOCAL I%
WHILE I%<LEN(A$)
I% += 1
IF ASCMID$(A$,I%)>127 THEN
A$ = LEFT$(A$,I%-1) + MID$(A$,I%+1)
ENDIF
ENDWHILE
= A$
Output:
Original ISO-8859-1 string: Français (length 11)
Control characters stripped: Français. (length 9)
Control & extended stripped: Franais. (length 8)
Bracmat
( "string of ☺☻♥♦⌂, may include control
characters and other ilk.\L\D§►↔◄
Rødgrød med fløde"
: ?string1
: ?string2
& :?newString
& whl
' ( @(!string1:?clean (%@:<" ") ?string1)
& !newString !clean:?newString
)
& !newString !string1:?newString
& out$(str$("Control characters stripped:
" str$!newString))
& :?newString
& whl
' ( @(!string2:?clean (%@:(<" "|>"~")) ?string2)
& !newString !clean:?newString
)
& !newString !string2:?newString
& out
$ ( str
$ ( "
Control characters and extended characters stripped:
"
str$!newString
)
)
& );
Output:
Control characters stripped:
string of ⌂, may include controlcharacters and other ilk.§Rødgrød med fløde
Control characters and extended characters stripped:
string of , may include controlcharacters and other ilk.Rdgrd med flde
C
#include <stdio.h>
#include <stdlib.h>
#define IS_CTRL (1 << 0)
#define IS_EXT (1 << 1)
#define IS_ALPHA (1 << 2)
#define IS_DIGIT (1 << 3) /* not used, just give you an idea */
unsigned int char_tbl[256] = {0};
/* could use ctypes, but then they pretty much do the same thing */
void init_table()
{
int i;
for (i = 0; i < 32; i++) char_tbl[i] |= IS_CTRL;
char_tbl[127] |= IS_CTRL;
for (i = 'A'; i <= 'Z'; i++) {
char_tbl[i] |= IS_ALPHA;
char_tbl[i + 0x20] |= IS_ALPHA; /* lower case */
}
for (i = 128; i < 256; i++) char_tbl[i] |= IS_EXT;
}
/* depends on what "stripped" means; we do it in place.
* "what" is a combination of the IS_* macros, meaning strip if
* a char IS_ any of them
*/
void strip(char * str, int what)
{
unsigned char *ptr, *s = (void*)str;
ptr = s;
while (*s != '\0') {
if ((char_tbl[(int)*s] & what) == 0)
*(ptr++) = *s;
s++;
}
*ptr = '\0';
}
int main()
{
char a[256];
int i;
init_table();
/* populate string with one of each char */
for (i = 1; i < 255; i++) a[i - 1] = i; a[255] = '\0';
strip(a, IS_CTRL);
printf("%s\n", a);
for (i = 1; i < 255; i++) a[i - 1] = i; a[255] = '\0';
strip(a, IS_CTRL | IS_EXT);
printf("%s\n", a);
for (i = 1; i < 255; i++) a[i - 1] = i; a[255] = '\0';
strip(a, IS_CTRL | IS_EXT | IS_ALPHA);
printf("%s\n", a);
return 0;
}
output: !"#$%&'()+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_abcdefghijklmnopqrstuvwxyz{|}~ <odd stuff my xterm thinks are bad unicode hence can't be properly shown> !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~
!"#$%&'()+,-./0123456789:;<=>?@[]^_`{|}~
## C++
```cpp
#include <string>
#include <iostream>
#include <algorithm>
#include <boost/lambda/lambda.hpp>
#include <boost/lambda/casts.hpp>
#include <ctime>
#include <cstdlib>
using namespace boost::lambda ;
struct MyRandomizer {
char operator( )( ) {
return static_cast<char>( rand( ) % 256 ) ;
}
} ;
std::string deleteControls ( std::string startstring ) {
std::string noControls( " " ) ;//creating space for
//the standard algorithm remove_copy_if
std::remove_copy_if( startstring.begin( ) , startstring.end( ) , noControls.begin( ) ,
ll_static_cast<int>( _1 ) < 32 && ll_static_cast<int>( _1 ) == 127 ) ;
return noControls ;
}
std::string deleteExtended( std::string startstring ) {
std::string noExtended ( " " ) ;//same as above
std::remove_copy_if( startstring.begin( ) , startstring.end( ) , noExtended.begin( ) ,
ll_static_cast<int>( _1 ) > 127 || ll_static_cast<int>( _1 ) < 32 ) ;
return noExtended ;
}
int main( ) {
std::string my_extended_string ;
for ( int i = 0 ; i < 40 ; i++ ) //we want the extended string to be 40 characters long
my_extended_string.append( " " ) ;
srand( time( 0 ) ) ;
std::generate_n( my_extended_string.begin( ) , 40 , MyRandomizer( ) ) ;
std::string no_controls( deleteControls( my_extended_string ) ) ;
std::string no_extended ( deleteExtended( my_extended_string ) ) ;
std::cout << "string with all characters: " << my_extended_string << std::endl ;
std::cout << "string without control characters: " << no_controls << std::endl ;
std::cout << "string without extended characters: " << no_extended << std::endl ;
return 0 ;
}
Output:
string with all characters: K�O:~���7�5����
���W��@>��ȓ�q�Q@���W-
string without control characters: K�O:~���7�5����
���W��@>��ȓ�q�Q@���W-
string without extended characters: KO:~75W@>qQ@W-
## C#
Uses the test string from REXX.
```c#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace RosettaCode
{
class Program
{
static void Main(string[] args)
{
string test = "string of ☺☻♥♦⌂, may include control characters and other ilk.♫☼§►↔◄";
Console.WriteLine("Original: {0}", test);
Console.WriteLine("Stripped of control codes: {0}", StripControlChars(test));
Console.WriteLine("Stripped of extended: {0}", StripExtended(test));
}
static string StripControlChars(string arg)
{
char[] arrForm = arg.ToCharArray();
StringBuilder buffer = new StringBuilder(arg.Length);//This many chars at most
foreach(char ch in arrForm)
if (!Char.IsControl(ch)) buffer.Append(ch);//Only add to buffer if not a control char
return buffer.ToString();
}
static string StripExtended(string arg)
{
StringBuilder buffer = new StringBuilder(arg.Length); //Max length
foreach(char ch in arg)
{
UInt16 num = Convert.ToUInt16(ch);//In .NET, chars are UTF-16
//The basic characters have the same code points as ASCII, and the extended characters are bigger
if((num >= 32u) && (num <= 126u)) buffer.Append(ch);
}
return buffer.ToString();
}
}
}
```
Output:
```txt
Original: string of ☺☻♥♦⌂, may include control characters and other ilk.♫☼§►↔◄
Stripped of control codes: string of ☺☻♥♦⌂, may include control characters and other ilk.♫☼§►↔◄
Stripped of extended: string of , may include control characters and other ilk.
```
## Clojure
```clojure
; generate our test string of characters with control and extended characters
(def range-of-chars (apply str (map char (range 256))))
; filter out the control characters:
(apply str (filter #(not (Character/isISOControl %)) range-of-chars))
; filter to return String of characters that are between 32 - 126:
(apply str (filter #(<= 32 (int %) 126) range-of-chars))
```
## Common Lisp
```txt
> (defparameter *extended-ascii* (coerce (loop for i from 0 to 255 collect (code-char i)) 'string))
*EXTENDED-ASCII*
> (defparameter *control-codes-stripped*
(remove-if #'(lambda (c)
(let ((x (char-code c)))
(or (< x 32) (= x 127))))
*extended-ascii*))
*CONTROL-CODES-STRIPPED*
> *control-codes-stripped*
" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklm¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
> (defparameter *control-codes-and-extended-stripped*
(remove-if-not #'(lambda (c) (and (standard-char-p c) (graphic-char-p c)))
*extended-ascii*))
*CONTROL-CODES-AND-EXTENDED-STRIPPED*
> *control-codes-and-extended-stripped*
" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
```
## D
```d
import std.traits;
S stripChars(S)(S s, bool function(dchar) pure nothrow mustStrip)
pure nothrow if (isSomeString!S) {
S result;
foreach (c; s) {
if (!mustStrip(c))
result ~= c;
}
return result;
}
void main() {
import std.stdio, std.uni;
auto s = "\u0000\u000A abc\u00E9def\u007F";
writeln(s.stripChars( &isControl ));
writeln(s.stripChars( c => isControl(c) || c == '\u007F' ));
writeln(s.stripChars( c => isControl(c) || c >= '\u007F' ));
}
```
{{out}}
```txt
abcédef
abcédef
abcdef
```
## Erlang
Exported functions to be used by [[Update_a_configuration_file]]
```Erlang
-module( strip_control_codes ).
-export( [is_not_control_code/1, is_not_control_code_nor_extended_character/1, task/0] ).
is_not_control_code( C ) when C > 127 -> true;
is_not_control_code( C ) when C < 32; C =:= 127 -> false;
is_not_control_code( _C ) -> true.
is_not_control_code_nor_extended_character( C ) when C > 127 -> false;
is_not_control_code_nor_extended_character( C ) -> is_not_control_code( C ).
task() ->
String = lists:seq( 0, 255 ),
io:fwrite( "String (~p characters): ~s~n", [erlang:length(String), String] ),
String_without_cc = lists:filter( fun is_not_control_code/1, String ),
io:fwrite( "String without control codes (~p characters): ~s~n", [erlang:length(String_without_cc), String_without_cc] ),
String_without_cc_nor_ec = lists:filter( fun is_not_control_code_nor_extended_character/1, String ),
io:fwrite( "String without control codes nor extended characters (~p characters): ~s~n", [erlang:length(String_without_cc_nor_ec), String_without_cc_nor_ec] ).
```
{{out}}
```txt
41> strip_control_codes:task().
String (256 characters): ^@^A^B^C^D^E^F^G^H
^N^O^P^Q^R^S^T^U^V^W^X^Y^Z^[^\^]^^^_ !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~^
¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ
String without control codes (223 characters): !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ
String without control codes nor extended characters (95 characters): !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
```
=={{header|F Sharp|F#}}==
Uses test string from REXX.
```fsharp
open System
let stripControl (arg:string) =
String(Array.filter (fun x -> not (Char.IsControl(x))) (arg.ToCharArray()))
//end stripControl
let stripExtended (arg:string) =
let numArr = Array.map (fun (x:char) -> Convert.ToUInt16(x)) (arg.ToCharArray()) in
String([|for num in numArr do if num >= 32us && num <= 126us then yield Convert.ToChar(num) |])
//end stripExtended
[]
let main args =
let test = "string of ☺☻♥♦⌂, may include control characters and other ilk.♫☼§►↔◄"
printfn "Original: %s" test
printfn "Stripped of controls: %s" (stripControl test)
printfn "Stripped of extended: %s" (stripExtended test)
0//main must return integer, much like in C/C++
```
Output:
```txt
Original: string of ☺☻♥♦, may include control characters and other ilk.♫☼§►↔◄
Stripped of controls: string of ☺☻♥♦, may include control characters and other ilk.♫☼§►↔◄
Stripped of extended: string of , may include control characters and other ilk.
```
## Factor
USING: ascii kernel sequences ;
: strip-control-codes ( str -- str' ) [ control? not ] filter ;
: strip-control-codes-and-extended ( str -- str' )
strip-control-codes [ ascii? ] filter ;
```
## Forth
```forth
: strip ( buf len -- buf len' ) \ repacks buffer, so len' <= len
over + over swap over ( buf dst limit src )
do
i c@ 32 127 within if
i c@ over c! char+
then
loop
over - ;
```
## Fortran
```fortran
module stripcharacters
implicit none
contains
pure logical function not_control(ch)
character, intent(in) :: ch
not_control = iachar(ch) >= 32 .and. iachar(ch) /= 127
end function not_control
pure logical function not_extended(ch)
character, intent(in) :: ch
not_extended = iachar(ch) >= 32 .and. iachar(ch) < 127
end function not_extended
pure function strip(string,accept) result(str)
character(len=*), intent(in) :: string
character(len=len(string)) :: str
interface
pure logical function accept(ch)
character, intent(in) :: ch
end function except
end interface
integer :: i,n
str = repeat(' ',len(string))
n = 0
do i=1,len(string)
if ( accept(string(i:i)) ) then
n = n+1
str(n:n) = string(i:i)
end if
end do
end function strip
end module stripcharacters
program test
use stripcharacters
character(len=256) :: string, str
integer :: ascii(256), i
forall (i=0:255) ascii(i) = i
forall (i=1:len(string)) string(i:i) = achar(ascii(i))
write (*,*) string
write (*,*) 'Control characters deleted:'
str = strip(string,not_control)
write (*,*) str
forall (i=1:len(string)) string(i:i) = achar(ascii(i))
write (*,*) 'Extended characters deleted:'
write (*,*) strip(string,not_extended)
end program test
```
## FreeBASIC
```freebasic
' FB 1.05.0 Win64
Function stripControlChars(s As Const String) As String
If s = "" Then Return ""
Dim count As Integer = 0
Dim strip(0 To Len(s) - 1) As Boolean
For i As Integer = 0 To Len(s) - 1
For j As Integer = 0 To 31
If s[i] = j OrElse s[i] = 127 Then
count += 1
strip(i) = True
Exit For
End If
Next j
Next i
Dim buffer As String = Space(Len(s) - count)
count = 0
For i As Integer = 0 To Len(s) - 1
If Not Strip(i) Then
buffer[count] = s[i]
count += 1
End If
Next
Return buffer
End Function
Function stripExtendedChars(s As Const String) As String
If s = "" Then Return ""
Dim count As Integer = 0
Dim strip(0 To Len(s) - 1) As Boolean
For i As Integer = 0 To Len(s) - 1
For j As Integer = 128 To 255
If s[i] = j Then
count += 1
strip(i) = True
Exit For
End If
Next j
Next i
Dim buffer As String = Space(Len(s) - count)
count = 0
For i As Integer = 0 To Len(s) - 1
If Not Strip(i) Then
buffer[count] = s[i]
count += 1
End If
Next
Return buffer
End Function
Dim s As String = !"\v\001The\t quick\255 \vbrown\127\f fox\156"
Dim s1 As String = stripControlChars(s)
Dim s2 As String = stripExtendedChars(s)
Dim s3 As String = stripExtendedChars(s1)
' Under Windows console, code page 850 :
' "vertical tab" displays as ♂
' "form feed" displays as ♀
' Chr(1) displays as ☺
' Chr(127) displays as ⌂
' the other control characters do what it says on the tin
' Chr(156) displays as £
' Chr(255) displays as space
Print "Before stripping :" , s
Print "Ctl chars stripped :" , s1
Print "Ext chars stripped :" , s2
Print "Both sets stripped :" , s3
Print
Print "Before stripping" , "Length => " ; Len(s)
Print "Ctl chars stripped" , "Length => " ; Len(s1)
Print "Ext chars stripped" , "Length => " ; Len(s2)
Print "Both sets stripped" , "Length => " ; Len(s3)
Print
Print "Press any key to quit"
Sleep
```
{{out}}
```txt
Before stripping : ♂☺The quick ♂brown⌂♀ fox£
Ctl chars stripped : The quick brown fox£
Ext chars stripped : ♂☺The quick ♂brown⌂♀ fox
Both sets stripped : The quick brown fox
Before stripping Length => 27
Ctl chars stripped Length => 21
Ext chars stripped Length => 25
Both sets stripped Length => 19
```
## Gambas
'''[https://gambas-playground.proko.eu/?gist=19db658a6c44cfb1f6f887ff53e549bb Click this link to run this code]'''
```gambas
Public Sub Main()
Dim sString As String = "The\t \equick\n \fbrownfox \vcost £125.00 or €145.00 or $160.00 \bto \ncapture ©®"
Dim sStd, sExtend As String
Dim siCount As Short
For siCount = 32 To 126
sStd &= Chr(siCount)
Next
For siCount = 128 To 255
sExtend &= Chr(siCount)
Next
Print "Original string: -\t" & sString & gb.NewLine
Print "No extended characters: -\t" & Check(sString, sStd)
sStd &= sExtend
Print "With extended characters: -\t" & Check(sString, sStd)
End
'________________________________________________________________
Public Sub Check(sString As String, sCheck As String) As String
Dim siCount As Short
Dim sResult As String
For siCount = 1 To Len(sString)
If InStr(sCheck, Mid(sString, siCount, 1)) Then sResult &= Mid(sString, siCount, 1)
Next
Return sResult
End
```
Output:
```txt
Original string: - The uick
brownfox ^Kcost £125.00 or €145.00 or $160.00to
capture ©®
No extended characters: - The quick brownfox cost 125.00 or 145.00 or $160.00 to capture
With extended characters: - The quick brownfox cost £125.00 or €145.00 or $160.00 to capture ©®
```
## Go
Go works for ASCII and non-ASCII systems. The first pair of functions below interpret strings as byte strings, presumably useful for strings consisting of ASCII and 8-bit extended ASCII data. The second pair of functions interpret strings as UTF-8.
```go
package main
import (
"golang.org/x/text/transform"
"golang.org/x/text/unicode/norm"
"fmt"
"strings"
)
// two byte-oriented functions identical except for operator comparing c to 127.
func stripCtlFromBytes(str string) string {
b := make([]byte, len(str))
var bl int
for i := 0; i < len(str); i++ {
c := str[i]
if c >= 32 && c != 127 {
b[bl] = c
bl++
}
}
return string(b[:bl])
}
func stripCtlAndExtFromBytes(str string) string {
b := make([]byte, len(str))
var bl int
for i := 0; i < len(str); i++ {
c := str[i]
if c >= 32 && c < 127 {
b[bl] = c
bl++
}
}
return string(b[:bl])
}
// two UTF-8 functions identical except for operator comparing c to 127
func stripCtlFromUTF8(str string) string {
return strings.Map(func(r rune) rune {
if r >= 32 && r != 127 {
return r
}
return -1
}, str)
}
func stripCtlAndExtFromUTF8(str string) string {
return strings.Map(func(r rune) rune {
if r >= 32 && r < 127 {
return r
}
return -1
}, str)
}
// Advanced Unicode normalization and filtering,
// see http://blog.golang.org/normalization and
// http://godoc.org/golang.org/x/text/unicode/norm for more
// details.
func stripCtlAndExtFromUnicode(str string) string {
isOk := func(r rune) bool {
return r < 32 || r >= 127
}
// The isOk filter is such that there is no need to chain to norm.NFC
t := transform.Chain(norm.NFKD, transform.RemoveFunc(isOk))
// This Transformer could also trivially be applied as an io.Reader
// or io.Writer filter to automatically do such filtering when reading
// or writing data anywhere.
str, _, _ = transform.String(t, str)
return str
}
const src = "déjà vu" + // precomposed unicode
"\n\000\037 \041\176\177\200\377\n" + // various boundary cases
"as⃝df̅" // unicode combining characters
func main() {
fmt.Println("source text:")
fmt.Println(src)
fmt.Println("\nas bytes, stripped of control codes:")
fmt.Println(stripCtlFromBytes(src))
fmt.Println("\nas bytes, stripped of control codes and extended characters:")
fmt.Println(stripCtlAndExtFromBytes(src))
fmt.Println("\nas UTF-8, stripped of control codes:")
fmt.Println(stripCtlFromUTF8(src))
fmt.Println("\nas UTF-8, stripped of control codes and extended characters:")
fmt.Println(stripCtlAndExtFromUTF8(src))
fmt.Println("\nas decomposed and stripped Unicode:")
fmt.Println(stripCtlAndExtFromUnicode(src))
}
```
Output: (varies with display configuration)
```txt
source text:
déjà vu
� !~��
as⃝df̅
as bytes, stripped of control codes:
déjà vu !~��as⃝df̅
as bytes, stripped of control codes and extended characters:
dj vu !~asdf
as UTF-8, stripped of control codes:
déjà vu !~��as⃝df̅
as UTF-8, stripped of control codes and extended characters:
dj vu !~asdf
as decomposed and stripped Unicode:
deja vu !~asdf
```
## Groovy
```Groovy
def stripControl = { it.replaceAll(/\p{Cntrl}/, '') }
def stripControlAndExtended = { it.replaceAll(/[^\p{Print}]/, '') }
```
Test:
```Groovy
def text = (0..255).collect { (char) it }.join('')
def textMinusControl = text.findAll { int v = (char)it; v > 31 && v != 127 }.join('')
def textMinusControlAndExtended = textMinusControl.findAll {((char)it) < 128 }.join('')
assert stripControl(text) == textMinusControl
assert stripControlAndExtended(text) == textMinusControlAndExtended
```
## Haskell
```Haskell
import Control.Applicative (liftA2)
strip, strip2 :: String -> String
strip = filter (liftA2 (&&) (> 31) (< 126) . fromEnum)
-- or
strip2 = filter (((&&) <$> (> 31) <*> (< 126)) . fromEnum)
main :: IO ()
main =
(putStrLn . unlines) $
[strip, strip2] <*> ["alphabetic 字母 with some less parochial parts"]
```
{{Out}}
```txt
alphabetic with some less parochial parts
alphabetic with some less parochial parts
```
=={{header|Icon}} and {{header|Unicon}}==
We'll use ''deletec'' to remove unwanted characters (2nd argument) from a string (1st argument). The procedure below coerces types back and forth between string and cset. The character set of unwanted characters is the difference of all ASCII characters and the ASCII characters from 33 to 126.
```Icon
procedure main(A)
write(image(deletec(&ascii,&ascii--(&ascii)[33:127])))
end
link strings
```
{{libheader|Icon Programming Library}}
[http://www.cs.arizona.edu/icon/library/src/procs/strings.icn strings.icn provides deletec]
The IPL procedure ''deletec'' is equivalent to this:
```Icon
procedure deletec(s, c) #: delete characters
result := ""
s ? {
while result ||:= tab(upto(c)) do tab(many(c))
return result ||:= tab(0)
}
end
```
Output:
```txt
" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}"
```
## J
'''Solution:'''
```j
stripControlCodes=: -.&(DEL,32{.a.)
stripControlExtCodes=: ([ -. -.)&(32}.127{.a.)
```
'''Usage:'''
```j
mystring=: a. {~ ?~256 NB. ascii chars 0-255 in random order
#mystring NB. length of string
256
#stripControlCodes mystring NB. length of string without control codes
223
#stripControlExtCodes mystring NB. length of string without control codes or extended chars
95
#myunicodestring=: u: ?~1000 NB. unicode characters 0-999 in random order
1000
#stripControlCodes myunicodestring
967
#stripControlExtCodes myunicodestring
95
stripControlExtCodes myunicodestring
k}w:]U3xEh9"GZdr/#^B.Sn%\uFOo[(`t2-J6*IA=Vf&N;lQ8,${XLz5?D0~s)'Y7Kq|ip41ejPy
```
[[Category:String manipulation]]
## JavaScript
### ES 5
```JavaScript
(function (strTest) {
// s -> s
function strip(s) {
return s.split('').filter(function (x) {
var n = x.charCodeAt(0);
return 31 < n && 127 > n;
}).join('');
}
return strip(strTest);
})("\ba\x00b\n\rc\fd\xc3");
```
{{Out}}
```JavaScript
"abcd"
```
## Java
{{works with|Java|8+}}
```java
import java.util.function.IntPredicate;
public class StripControlCodes {
public static void main(String[] args) {
String s = "\u0000\n abc\u00E9def\u007F";
System.out.println(stripChars(s, c -> c > '\u001F' && c != '\u007F'));
System.out.println(stripChars(s, c -> c > '\u001F' && c < '\u007F'));
}
static String stripChars(String s, IntPredicate include) {
return s.codePoints().filter(include::test).collect(StringBuilder::new,
StringBuilder::appendCodePoint, StringBuilder::append).toString();
}
}
```
```txt
abcédef
abcdef
```
## jq
{{works with|jq|1.4}}
```jq
def strip_control_codes:
explode | map(select(. > 31 and . != 127)) | implode;
def strip_extended_characters:
explode | map(select(31 < . and . < 127)) | implode;
```
'''Example''':
```jq
def string: "string of ☺☻♥♦⌂, may include control characters such as null(\u0000) and other ilk.\n§►↔◄\nRødgrød med fløde";
"string | strip_control_codes\n => \(string | strip_control_codes)",
"string | strip_extended_characters\n => \(string | strip_extended_characters)"
```
{{out}}
```sh
$ jq -n -r -f Strip_control_codes_and_extended_characters.jq
string | strip_control_codes
=> string of ☺☻♥♦⌂, may include control characters such as null() and other ilk.§►↔◄Rødgrød med fløde
string | strip_extended_characters
=> string of , may include control characters such as null() and other ilk.Rdgrd med flde
```
## Julia
```Julia
stripc0{T<:String}(a::T) = replace(a, r"[\x00-\x1f\x7f]", "")
stripc0x{T<:String}(a::T) = replace(a, r"[^\x20-\x7e]", "")
a = "a\n\tb\u2102d\u2147f"
println("Original String:\n ", a)
println("\nWith C0 control characters removed:\n ", stripc0(a))
println("\nWith C0 and extended characters removed:\n ", stripc0x(a))
```
{{out}}
```txt
Original String:
a
bℂdⅇf
With C0 control characters removed:
abℂdⅇf
With C0 and extended characters removed:
abdf
```
## Kotlin
```scala
// version 1.1.2
fun String.strip(extendedChars: Boolean = false): String {
val sb = StringBuilder()
for (c in this) {
val i = c.toInt()
if (i in 32..126 || (!extendedChars && i >= 128)) sb.append(c)
}
return sb.toString()
}
fun main(args: Array) {
println("Originally:")
val s = "123\tabc\u0007DEF\u007F+-*/€æŧðłþ"
println("String = $s Length = ${s.length}")
println("\nAfter stripping control characters:")
val t = s.strip()
println("String = $t Length = ${t.length}")
println("\nAfter stripping control and extended characters:")
val u = s.strip(true)
println("String = $u Length = ${u.length}")
}
```
{{out}}
```txt
Originally:
String = 123 abcDEF+-*/€æŧðłþ Length = 22
After stripping control characters:
String = 123abcDEF+-*/€æŧðłþ Length = 19
After stripping control and extended characters:
String = 123abcDEF+-*/ Length = 13
```
## Liberty BASIC
```lb
all$ =""
for i =0 to 255
all$ =all$ +chr$( i)
next i
print "Original string of bytes. ( chr$( 10) causes a CRLF.)"
print all$
print
lessControl$ =controlStripped$( all$)
print "With control codes stripped out."
print lessControl$
print
lessExtendedAndControl$ =extendedStripped$( lessControl$)
print "With extended codes stripped out too."
print lessExtendedAndControl$
end
function controlStripped$( i$)
r$ =""
for j =1 to len( i$)
ch$ =mid$( i$, j, 1)
if asc( ch$) >=32 then r$ =r$ +ch$
next j
controlStripped$ =r$
end function
function extendedStripped$( i$)
r$ =""
for j =1 to len( i$)
ch$ =mid$( i$, j, 1)
if asc( ch$) <=128 then r$ =r$ +ch$
next j
extendedStripped$ =r$
end function
```
## Lua
```lua
function Strip_Control_Codes( str )
local s = ""
for i in str:gmatch( "%C+" ) do
s = s .. i
end
return s
end
function Strip_Control_and_Extended_Codes( str )
local s = ""
for i = 1, str:len() do
if str:byte(i) >= 32 and str:byte(i) <= 126 then
s = s .. str:sub(i,i)
end
end
return s
end
q = ""
for i = 0, 255 do
q = q .. string.char(i)
end
print( Strip_Control_Codes(q) )
print( Strip_Control_and_Extended_Codes(q) )
```
```txt
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
```
## Mathematica
```Mathematica
stripCtrl[x_]:=StringJoin[Select[Characters[x],
MemberQ[CharacterRange["!","~"]~Join~Characters[FromCharacterCode[Range[128,255]]],#]&]]
stripCtrlExt[x_]:=StringJoin[Select[Characters[x],
MemberQ[CharacterRange["!","~"],#]&]]
```
Test:
```txt
CompleteSet=FromCharacterCode[Range[0,255]]
->\.00\.02\.03\.04\.05\.06\.07\.08\.0b\.0e\.0f\.10\.11\.12\.13\.14
\.15\.16\.17\.18\.19\.1a\[RawEscape]\.1c\.1d\.1e\.1f !"#$%&'()*+,-./
0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]
^_`abcdefghijklmnopqrstuvwxyz{|}~
¡¢£¤¥¦§¨©ª«\[Not]®¯\[Degree]
\[PlusMinus]\.b2\.b3\.b4\[Micro]\[Paragraph]\[CenterDot]¸¹º»¼½¾¿
ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ*ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö/øùúûüýþÿ
stripCtrl[CompleteSet]
->!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]
^_`abcdefghijklmnopqrstuvwxyz{|}~
¡¢£¤¥¦§¨©ª«\[Not]®¯\[Degree]
\[PlusMinus]\.b2\.b3\.b4\[Micro]\[Paragraph]\[CenterDot]
¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ*ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö
/øùúûüýþÿ
stripCtrlExt[CompleteSet]
->!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]
^_`abcdefghijklmnopqrstuvwxyz{|}~
```
=={{header|MATLAB}} / {{header|Octave}}==
```MATLAB
function str = stripped(str)
str = str(31 127
let strip f str =
let len = String.length str in
let res = Bytes.create len in
let rec aux i j =
if i >= len
then Bytes.to_string (Bytes.sub res 0 j)
else if f str.[i]
then aux (succ i) j
else begin
Bytes.set res j str.[i];
aux (succ i) (succ j)
end
in
aux 0 0
let () =
Random.self_init ();
let len = 32 in
let s =
String.init len (fun _ ->
char_of_int (Random.int 256))
in
print_endline (strip is_control_code s);
print_endline (strip (fun c -> (is_control_code c) || (is_extended_char c)) s);
;;
```
## Pascal
{{works with|Free_Pascal}}
```pascal
program StripCharacters(output);
function Strip (s: string; control, extended: boolean): string;
var
index: integer;
begin
Strip := '';
for index:= 1 to length(s) do
if not ((control and (ord(s[index]) <= 32)) or (extended and (ord(s[index]) > 127))) then
Strip := Strip + s[index];
end;
var
test: string;
i: integer;
begin
setlength(test, 40);
randomize;
for i := 1 to length(test) do
test[i] := char(1 + random(255));
writeln ('Original: ', test);
writeln ('No CNTL: ', Strip(test, true, false));
writeln ('No extnd: ', Strip(test, false, true));
writeln ('ASCII: ', Strip(test, true, true));
end.
```
Output:
```txt
% ./StripCharacters
Original: )?z8i9?a?K??N?s?F˪w?a??s
#?b?B}PT?ٜ
No CNTL: )?z8i9?a?K??N?s?F˪w?a??s#?b?B}PT?ٜ
No extnd: )z8i9aKNsFwas
#bB}PT
ASCII: )z8i9aKNsFwas#bB}PT
```
## Peloton
Peloton has a native instruction for removing control codes from a string, SAL, the Low ASCII Strip. From the manual:
```sgml>Create variable with control characters: <@ SAYLETVARLIT
i|This string has control characters
- - - - - -
in it
Strip control characters <@ SAYSALVAR>i
Assign infix <@ LETVARSALVAR>j|i <@ SAYVAR>j
Assign prepend <@ LETSALVARVAR>k|i <@ SAYVAR>k
Reflexive assign <@ ACTSALVAR>i <@ SAYVAR>i
```
Peloton also has SAH, High ASCII Strip. Again, from the manual:
```sgml>Create variable with high and low ANSI: <@ SAYLETVARLIT
i|This string has both low ansi and high ansi characters - il doit d'être prévenu
Strip high ANSI <@ SAYSAHVAR>i
Assign infix <@ LETVARSAHVAR>j|i <@ SAYVAR>j
Assign prepend <@ LETSAHVARVAR>k|i <@ SAYVAR>k
Reflexive assign <@ ACTSAHVAR>i <@ SAYVAR>i
```
## Perl
```Perl
#!/usr/bin/perl -w
use strict ;
my @letters ;
my @nocontrols ;
my @noextended ;
for ( 1..40 ) {
push @letters , int( rand( 256 ) ) ;
}
print "before sanitation : " ;
print join( '' , map { chr( $_ ) } @letters ) ;
print "\n" ;
@nocontrols = grep { $_ > 32 && $_ != 127 } @letters ;
print "Without controls: " ;
print join( '' , map { chr( $_ ) } @nocontrols ) ;
@noextended = grep { $_ < 127 } @nocontrols ;
print "\nWithout extended: " ;
print join( '' , map { chr( $_ ) } @noextended ) ;
print "\n" ;
```
Output:
before sanitation : �L08&YH�O��n)�:���O�G$���.���"zO���Q�?��
Without controls: �L08&YH�O��n)�:�O�G$���.���"zO��Q�?��
Without extended: L08&YHOn):OG$."zOQ?
## Perl 6
{{works with|Rakudo|2018.03}}
```perl6
my $str = (0..400).roll(80)».chr.join;
say $str;
say $str.subst(/<:Cc>/, '', :g); # unicode property: control character
say $str.subst(/<-[\ ..~]>/, '', :g);
```
```txt
kşaNĹĭŗ|Ęw��"ÄlĄWł8iCƁę��Ż�¬5ĎĶ'óü¸'ÍŸ;ŢƐ¦´ŷQċűÒŴ$ÃŅĐįð+=ĥƂ+Ōĭħ¼ŕc¤H~ìïēÕ
kşaNĹĭŗ|Ęw"ÄlĄWł8iCƁ꯬5ĎĶ'óü¸'ÍŸ;ŢƐ¦´ŷQċűÒŴ$ÃŅĐįð+=ĥƂ+Ōĭħ¼ŕc¤H~ìïēÕ
kaN|w"lW8iC5'';Q$+=+cH~
```
## Phix
{{trans|Ada}}
While you can delete a character from a string using say s[i..i] = "", the fastest and easiest way is always just
to build a new one character-by-character.
I've credited Ada solely for the sensible fromch/toch/abovech idea.
```Phix
function filter(string s, integer fromch=' ', toch=#7E, abovech=#7F)
string res = ""
for i=1 to length(s) do
integer ch = s[i]
if ch>=fromch and (ch<=toch or ch>abovech) then
res &= ch
end if
end for
return res
end function
procedure put_line(string text, s)
printf(1,"%s \"%s\", Length:%d\n",{text,s,length(s)})
end procedure
string full = "\u0000 abc\u00E9def\u007F"
put_line("The full string:", full)
put_line("No Control Chars:", filter(full)) -- default values for fromch, toch, and abovech
put_line("\" and no Extended:", filter(full, abovech:=#FF)) -- defaults for fromch and toch
```
{{out}}
```txt
The full string: " abc+®def", Length:11
No Control Chars: " abc+®def", Length:9
" and no Extended: " abcdef", Length:7
```
## PicoLisp
Control characters in strings are written with a hat (^) in PicoLisp. ^? is the DEL character.
```PicoLisp
(de stripCtrl (Str)
(pack
(filter
'((C)
(nor (= "^?" C) (> " " C "^A")) )
(chop Str) ) ) )
(de stripCtrlExt (Str)
(pack
(filter
'((C) (> "^?" C "^_"))
(chop Str) ) ) )
```
Test:
```txt
: (char "^?")
-> 127
: (char "^_")
-> 31
: (stripCtrl "^I^M a b c^? d äöüß")
-> " a b c d äöüß"
: (stripCtrlExt "^I^M a b c^? d äöüß")
-> " a b c d "
```
## Pike
```Pike>
string input = random_string(100);
> (string)((array)input-enumerate(32)-enumerate(255-126,1,127));
Result: "p_xx08M]cK)Tm= '00100000'b | unspec(c) = '01111111'b then
do;
j = j + 1;
substr(w, j, 1) = c;
end;
end;
s = substr(w, 1, j);
end stripcc;
/* Strips control codes and extended characters. */
stripex: procedure (s);
declare s character (*) varying;
declare w character (length(s));
declare c character (1);
declare (i, j) fixed binary;
j = 0;
do i = 1 to length (s);
c = substr(s, i, 1);
if unspec(c) >= '00100000'b & unspec(c) < '01111111'b then
do;
j = j + 1;
substr(w, j, 1) = c;
end;
end;
s = substr(w, 1, j);
end stripex;
end stripper;
```
Output:
```txt
the�quick�brown�fox�jumped
thequickbrownfoxjumped
now¡is¡the¡time¡for¡all¡good¡men
nowisthetimeforallgoodmen
```
## PowerShell
```PowerShell
function Remove-Character
{
[CmdletBinding(DefaultParameterSetName="Control and Extended")]
[OutputType([string])]
Param
(
[Parameter(Mandatory=$true,
ValueFromPipeline=$true,
ValueFromPipelineByPropertyName=$true,
Position=0)]
[string]
$String,
[Parameter(ParameterSetName="Control")]
[switch]
$Control,
[Parameter(ParameterSetName="Extended")]
[switch]
$Extended
)
Begin
{
filter Remove-ControlCharacter
{
$_.ToCharArray() | ForEach-Object -Begin {$out = ""} -Process {if (-not [Char]::IsControl($_)) {$out += $_ }} -End {$out}
}
filter Remove-ExtendedCharacter
{
$_.ToCharArray() | ForEach-Object -Begin {$out = ""} -Process {if ([int]$_ -lt 127) {$out += $_ }} -End {$out}
}
}
Process
{
foreach ($s in $String)
{
switch ($PSCmdlet.ParameterSetName)
{
"Control" {$s | Remove-ControlCharacter}
"Extended" {$s | Remove-ExtendedCharacter}
Default {$s | Remove-ExtendedCharacter | Remove-ControlCharacter}
}
}
}
}
```
```PowerShell
$test = "$([char]9)Français."
"Original string : `"$test`""
"Control characters stripped : `"$($test | Remove-Character -Control)`""
"Extended characters stripped : `"$($test | Remove-Character -Extended)`""
"Control & extended stripped : `"$($test | Remove-Character)`""
```
{{Out}}
```txt
Original string : " Français."
Control characters stripped : "Français."
Extended characters stripped : " Franais."
Control & extended stripped : "Franais."
```
```PowerShell
"Français", "Čeština" | Remove-Character -Extended
```
{{Out}}
```txt
Franais
etina
```
## PureBasic
```PureBasic
Procedure.s stripControlCodes(source.s)
Protected i, *ptrChar.Character, length = Len(source), result.s
*ptrChar = @source
For i = 1 To length
If *ptrChar\c > 31
result + Chr(*ptrChar\c)
EndIf
*ptrChar + SizeOf(Character)
Next
ProcedureReturn result
EndProcedure
Procedure.s stripControlExtCodes(source.s)
Protected i, *ptrChar.Character, length = Len(source), result.s
*ptrChar = @source
For i = 1 To length
If *ptrChar\c > 31 And *ptrChar\c < 128
result + Chr(*ptrChar\c)
EndIf
*ptrChar + SizeOf(Character)
Next
ProcedureReturn result
EndProcedure
If OpenConsole()
;create sample string
Define i, s.s
For i = 1 To 80
s + Chr(Random(254) + 1) ;include character values from 1 to 255
Next
PrintN(stripControlCodes(s)) ;string without control codes
PrintN("---------")
PrintN(stripControlExtCodes(s)) ;string without control codes or extended chars
Print(#CRLF$ + #CRLF$ + "Press ENTER to exit"): Input()
CloseConsole()
EndIf
```
Sample output:
```txt
»╫=┐C─≡G(═ç╤â√╝÷╔¬ÿ▌x è4∞|)ï└⌐ƒ9²òτ┌ºáj)▓<~-vPÿφQ╨ù¿╖îFh"[ü╗dÉ₧q#óé├p╫■
---------
=CG(x 4|)9j)<~-vPQFh"[dq#p
```
## Python
```Python
stripped = lambda s: "".join(i for i in s if 31 < ord(i) < 127)
print(stripped("\ba\x00b\n\rc\fd\xc3"))
```
Output:abcd
```
## Racket
```Racket
#lang racket
;; Works on both strings (Unicode) and byte strings (raw/ASCII)
(define (strip-controls str)
(regexp-replace* #rx"[\0-\037\177]+" str ""))
(define (strip-controls-and-extended str)
(regexp-replace* #rx"[^\040-\176]+" str ""))
```
## REXX
Note that ''guillemets'' were used as fences in presenting/displaying the «««before»»» and «««after»»» text strings.
### idiomatic version
This REXX version processes each character in an idiomatic way (if it's a wanted character, then keep it).
```rexx
/*REXX program strips all "control codes" from a character string (ASCII or EBCDIC). */
z= 'string of ☺☻♥♦⌂, may include control characters and other ♫☼§►↔◄░▒▓█┌┴┐±÷²¬└┬┘ilk.'
@=' !"#$%&''()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~'
$=
do j=1 for length(z); _=substr(z, j, 1) /*get a char from X one at a time. */
if verify(_, @)==0 then $=$ || _ /*Is char in the @ list? Then use it.*/
end /*j*/ /*stick a fork in it, we're all done. */
say 'old = »»»'z"«««" /*add ««fence»» before & after old text*/
say 'new = »»»'$"«««" /* " " " " " new " */
```
{{out|output}}
```txt
old = »»»string of ☺☻♥♦⌂, may include control characters and other ♫☼§►↔◄░▒▓█┌┴┐±÷²¬└┬┘ilk.«««
new = »»»string of , may include control characters and other ilk.«««
```
### faster version
This REXX version only deletes unwanted characters.
It also shows a different way of performing concatenations (without using abutments, and a way to split a long literal (character) string.
Because there are (or should be) fewer unwanted characters than wanted characters, this version is faster.
```rexx
/*REXX program strips all "control codes" from a character string (ASCII or EBCDIC). */
x= 'string of ☺☻♥♦⌂, may include control characters and other ♫☼§►↔◄░▒▓█┌┴┐±÷²¬└┬┘ilk.'
@=' !"#$%&''()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghij' || ,
'klmnopqrstuvwxyz{|}~'
$=x /*set "new" string to same as the old. */
do until _=0; _=verify($, @) /*check if any character isn't in @.*/
if _\==0 then $=delstr($, _, 1) /*Is this a bad char? Then delete it.*/
end /*until*/ /*stick a fork in it, we're all done. */
say 'old = »»»' || x || "«««" /*add ««fence»» before & after old text*/
say 'new = »»»' || $ || "«««" /* " " " " " new " */
```
{{out|output|text= is identical to the 1st REXX version.}}
## Ring
```ring
s = char(31) + "abc" + char(13) + "def" + char(11) + "ghi" + char(10)
see strip(s) + nl
func strip str
strip = ""
for i = 1 to len(str)
nr = substr(str,i,1)
a = ascii(nr)
if a > 31 and a < 123 and nr != "'" and nr != """"
strip = strip + nr ok
next
return strip
```
## Ruby
```ruby
class String
def strip_control_characters()
chars.each_with_object("") do |char, str|
str << char unless char.ascii_only? and (char.ord < 32 or char.ord == 127)
end
end
def strip_control_and_extended_characters()
chars.each_with_object("") do |char, str|
str << char if char.ascii_only? and char.ord.between?(32,126)
end
end
end
p s = "\ba\x00b\n\rc\fd\xc3\x7ffoo"
p s.strip_control_characters
p s.strip_control_and_extended_characters
```
{{out}}
```txt
"\ba\u0000b\n\rc\fd\xC3\u007Ffoo"
"abcd\xC3foo"
"abcdfoo"
```
## Run BASIC
```runbasic
s$ = chr$(31) + "abc" + chr$(13) + "def" + chr$(11) + "ghi" + chr$(10)
print strip$(s$)
' -----------------------------------------
' strip junk
' -----------------------------------------
FUNCTION strip$(str$)
for i = 1 to len(str$)
a$ = MID$(str$,i,1)
a = ASC(a$)
if a > 31 then
if a < 123 then
if a$ <> "'" then
if a$ <> """" then
strip$ = strip$ + a$
end if
end if
end if
end if
next i
END FUNCTION
```
```txt
input : chr$(31)+"abc"+chr$(13)+"def"+chr$(11)+"ghi"+chr$(10)
output : abcdefghi
```
## Scala
### ASCII: Using StringOps Class
```Scala
val controlCode : (Char) => Boolean = (c:Char) => (c <= 32 || c == 127)
val extendedCode : (Char) => Boolean = (c:Char) => (c <= 32 || c > 127)
// ASCII test...
val teststring = scala.util.Random.shuffle( (1.toChar to 254.toChar).toList ).mkString
println( "ctrl filtered out: \n\n" +
teststring.filterNot(controlCode) + "\n" )
println( "ctrl and extended filtered out: \n\n" +
teststring.filterNot(controlCode).filterNot(extendedCode) + "\n" )
```
{{out}}
```txt
ctrl filtered out:
?d2??6ú╖)ⁿ┼gEhW3RS⌠!a?┬╘├╢-ß?·▄╔B,_?╟│┤'C║j«?ΩcqJ╣²▀÷±?0s∩░uτ8Φ½&Σ¬y▓H?*?AL?═eDX??≥╚╧
4σ+r=Ѽ╙U▌"?.⌐?≡K?k╥áF\?╕QΘ?╪Z?▐√╠?`M?7▒°G^≈@xz?>t:╦╨íw¿─┐]Io(V╡?P¡┴?º┌ΓO┘φ└╓~|#⌡π?}µ
╗l???$ó{n/╫mi╤<9f≤?∙»Nª;?1??εT?■╩%╒╛[╜p∞α╬vñ╞bYδ╝5█
ctrl and extended filtered out:
?d26)gEhW3RS!a-B,_'CjcqJ0su8&yH*ALeDX4+r=U".KkF
\QZ`M7G^@xz>t:w]Io(VPO~|#}l${n/mi<9fN;1T%[pvbY5
```
### Unicode: Using Regular Expressions
```Scala
//
// A Unicode test string
//
val ulist = 0x8232.toChar :: 0xFFF9.toChar :: 0x200E.toChar :: (1.toChar to 2000.toChar).toList
val ustring = scala.util.Random.shuffle( ulist ).mkString
// Remove control codes including private codes
val sNoCtrlCode = ustring.replaceAll("[\\p{C}]","")
val htmlNoCtrlCode = for( i <- sNoCtrlCode.indices ) yield
"&#" + sNoCtrlCode(i).toInt + ";" + (if( (i+1) % 10 == 0 ) "\n" else "")
println( "ctrl filtered out:
\n\n" + htmlNoCtrlCode.mkString + "
\n" )
// Keep 0x00-0x7f and remove control codes
val sNoExtCode = ustring.replaceAll("[^\\p{InBasicLatin}]","").replaceAll("[\\p{C}]","")
val htmlNoExtCode = for( i <- sNoExtCode.indices ) yield
"&#" + sNoExtCode(i).toInt + ";" + (if( (i+1) % 10 == 0 ) "\n" else "")
println( "ctrl and extended filtered out:
\n\n" + htmlNoExtCode.mkString + "
\n" )
```
{{out}}
```txt
ctrl filtered out:
Қ۳ҹؽݠČǗ ɄخȿѻȺ·˖ҎDװѩԸץ˶٤ǞĽۭԑϣʱƁΫیոϐۛؕƟͱӄצ
ݞÄҺϤΪq͆ݶȲֆ֫՞ѡ٘ٺ݅ݦϠ۸ܞЕ²ɋډҒӂȏϘʚΧ˾ܡȳևՋƖדȇހڷ
ӣ؊ՙ̨۟ۀĦ¬ς݇؛ĿΟՕƜ1ԵۣݬͮDŽ̪عڔЊڳœӟѺ՜ʬΚ݀͗̾ʊáLJѪ
ٹȭםޮɅ֜ʼݥޤڎۊŭЁ˹īʶñۼ[ӽه:3ŜSԛģó͑؝Јי̅ݏˬˮіۍ
PԅMѯԶɔܺ֘ݷԾڽˎΞn̏ŗۧ˒ޥϷDžŀ˳Ѡ̮ݕũۃɹƾފѼܚٍڢŽܛńի
߀CžʾʹքӭξҖҢǘZ<ɼÐՅ̔ݧئ٫ʖѬ̩ߌǿɇݻ÷ђΤǀёՓJѦϻΥ¨̦ڥ
ˍ͖٭зݡѧס̶̵¯ȐƌޭԮϙҦ+ڦÇ֍ɽƥЦ۩ǦҠêʧɮð̣̯ޘƭƠͺޠݩγ
ѳ֊НۜÚӺϭ̃ݵƬŇЎٛԪճɟЩЋֱϜޒfޓʨܮɱղŬέǏu։Ҹ˅رɾʘͅ
߃¾ª"ɖȾύƔýՈԉգȨڼۮ͍õŘ]àߊܱЫҴٗԞۢ ˂ہƞɺƚ۞ҤڻƸǵǯ
܄ʠƲťïܠmТϋɥΈώͶ٢ؖټ\Ŵˣé֔ڤÿϛσ߂Λøʞӿăմ؉ϪЗպƓ҆܀ݰ
ѹΏɨғڲƀɞԗ26Ĕŵ³ѥ͛ǨՄǓĻڊʝӹʍ̠ϰʄՍə܅лġޏnj˴ʃ۵Ϻdž
՟Ҽ̈۹ԺߎМރѵ͋ؾЇѐ|ԨةݝɕǕڴljȩþؐ؆j˿ق۽ɳОѷęijٯÂěȴ
˓חګ٠ޅךćءɉӢɗчЉő͜Ѐ֨ےϸܽԀ»эјۇޣ֤Ґ͊ȫއɒۓ۷́ضӖΙَБ
×ʳҧЅȗUƅŷÈɸȕ܆ĵޖȁɢӼԒѢխǖ@ǡȰўҍГӛº۾ף˔ъͣʏ«ћڏ
حǟΖԕƑǼթٸe֦ʗސڍƙКԻ̿ιü̧´փϱʤܭηƷѨЮԭѿ¢ßݚؒ٪ҩʢں`
۠μưɍӉØN̬ވƘȈ֎ǝٙӷΨи¥еοݫ̷Ɨ?ͰĹ֝ݸ_؇Àׁ̌ûʥĭȶǍԔ
үơ̕ג˗ϑӤӰ'άܶѮĀشڱӻǻܼƿ܉ͪѰܑ̓K~Ұ֮πҬʷ˫ۯٿpВ̥
տؓЍܒ˲ӥɰާڜԫ͎ϿűӈϦƤڣʓƎѱޛяâޱƻЄÃ̸ـ̂֕Ӛ̗֣ͬӦ݄ۑƦܖ
߄ɷۉڨȑձІȖƯٵۡуħۦِ̱ԢɑФ١̺دʂsչ.ۋҾėè˭ٷbϮݱݔǩʈ
ȻiͫϯԦĚػţ܍եֿχ݂ت܁լɀгޙȥʼnˈՇݣ̰ӊɩɲȢәNJȬ֙׀ݼŏكЭ
ʒױ̼љфȃHՖ؟҂̢ʕʲƼްӀŁڄ˼ȅԙÙ7ّſۘ٩ȱ֟ƕ͕ʆŚͼօ°؈>ݺ
...
ctrl and extended filtered out:
Dq1[:3SPMnCZ<J+fu"]m\26|jU@e`N?_'K~ps.biH7>zAXVF5
=OgBhYGc-4)E/*a,%wTLoR&W{kd}8l^;0#(!trvIx$Qy9
```
## Seed7
Seed7 [http://seed7.sourceforge.net/manual/types.htm#string strings] are UTF-32 encoded,
therefore no destinction between BYTE and Unicode strings is necessary.
The example below uses [http://seed7.sourceforge.net/libraries/utf8.htm#STD_UTF8_OUT STD_UTF8_OUT]
from the library [http://seed7.sourceforge.net/libraries/utf8.htm utf8.s7i], to write
Unicode characters with UTF-8 encoding to the console.
```seed7
$ include "seed7_05.s7i";
include "utf8.s7i";
const func string: stripControl (in string: stri) is func
result
var string: stripped is "";
local
var integer: old_pos is 1;
var integer: index is 0;
var char: ch is ' ';
begin
for ch key index range stri do
if ch < ' ' or ch = '\127;' then
stripped &:= stri[old_pos .. pred(index)];
old_pos := succ(index);
end if;
end for;
stripped &:= stri[old_pos ..];
end func;
const func string: stripControlAndExtended (in string: stri) is func
result
var string: stripped is "";
local
var integer: old_pos is 1;
var integer: index is 0;
var char: ch is ' ';
begin
for ch key index range stri do
if ch < ' ' or ch >= '\127;' then
stripped &:= stri[old_pos .. pred(index)];
old_pos := succ(index);
end if;
end for;
stripped &:= stri[old_pos ..];
end func;
const string: src is "déjà vu\ # Unicode
\\n\0;\31; \33;\126;\127;\128;\255;\n\ # Various boundary cases
\as⃝df̅"; # Unicode combining characters
const proc: main is func
begin
OUT := STD_UTF8_OUT;
writeln("source text:");
writeln(src);
writeln("Stripped of control codes:");
writeln(stripControl(src));
writeln("Stripped of control codes and extended characters:");
writeln(stripControlAndExtended(src));
end func;
```
Output:
```txt
source text:
déjà vu
� !~ÿ
as⃝df̅
Stripped of control codes:
déjà vu !~ÿas⃝df̅
Stripped of control codes and extended characters:
dj vu !~asdf
```
## Sidef
```ruby
var str = "\ba\x00b\n\rc\fd\xc3\x7ffoo"
var letters = str.chars.map{.ord}
say letters.map{.chr}.join.dump
var nocontrols = letters.grep{ (_ > 32) && (_ != 127) }
say nocontrols.map{.chr}.join.dump
var noextended = nocontrols.grep{ _ < 127 }
say noextended.map{.chr}.join.dump
```
{{out}}
```txt
"\ba\0b\n\rc\fd\xC3\x7Ffoo"
"abcd\xC3foo"
"abcdfoo"
```
## Tcl
```tcl
proc stripAsciiCC str {
regsub -all {[\u0000-\u001f\u007f]+} $str ""
}
proc stripCC str {
regsub -all {[^\u0020-\u007e]+} $str ""
}
```
=={{header|TI-83 BASIC}}==
TI-83 BASIC doesn't support ASCII or Unicode, so the following program just strips every character that doesn't have a corresponding glyph from 32 to 126 decimal in a real ASCII table.
The following "normal characters" do exist, but can't be typed on the calculator and a hex editor must be used to enter them:
```ti83b
#$&@;_`abcdefghijklmnopqrstuvwxyz|~
```
The double quote character (ASCII decimal 34) can be entered, but cannot be escaped and thus cannot be stored to strings without the use of hex editors. The following program will remove double quotes from the input string if they were hacked in simply because having one stored to the "check" string is syntactically invalid.
So, in sum, you have to hack the calculator to enter in this program, but once it's entered you can transfer it to unhacked calculators and it will work.
```ti83b
:" !#$%&'()*+,-./0123456789:;<=>?ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~"→Str0
:Input ">",Str1
:":"+Str1+":"→Str1
:For(I,2,length(Str1)-2)
:If not(inString(Str0,sub(Str1,I,1)))
:sub(Str1,1,I-1)+sub(Str1,I+1,length(Str1)-(I+1))→Str1
:End
:sub(Str1,2,length(Str1)-1)→Str1
:Pause Str1
```
## TXR
{{trans|Racket}}
```txrlisp
(defun strip-controls (str)
(regsub #/[\x0-\x1F\x7F]+/ "" str))
(defun strip-controls-and-extended (str)
(regsub #/[^\x20-\x7F]+/ "" str))
```
## VBScript
Derived from the BASIC version.
```vb
Function StripCtrlCodes(s)
tmp = ""
For i = 1 To Len(s)
n = Asc(Mid(s,i,1))
If (n >= 32 And n <= 126) Or n >=128 Then
tmp = tmp & Mid(s,i,1)
End If
Next
StripCtrlCodes = tmp
End Function
Function StripCtrlCodesExtChrs(s)
tmp = ""
For i = 1 To Len(s)
n = Asc(Mid(s,i,1))
If n >= 32 And n <= 126 Then
tmp = tmp & Mid(s,i,1)
End If
Next
StripCtrlCodesExtChrs = tmp
End Function
WScript.StdOut.Write "ab�cd�ef�gh€" & " = " & StripCtrlCodes("ab�cd�ef�gh€")
WScript.StdOut.WriteLine
WScript.StdOut.Write "ab�cd�ef�ghij†klð€" & " = " & StripCtrlCodesExtChrs("ab�cd�ef�ghij†klð€")
WScript.StdOut.WriteLine
```
{{Out}}
```txt
ab�cd�ef�gh€ = abcdefgh€
ab�cd�ef�ghij†klð€ = abcdefghijkl
```
## XPL0
```XPL0
include c:\cxpl\codes; \intrinsic 'code' declarations
string 0; \use zero-terminated string convention
proc Strip(Str, Both); \Strip out control and optionally extended chars
char Str; int Both;
int I, J, C;
[I:= 0;
while Str(I) do
[C:= Str(I);
if Both then C:= extend(C); \if stripping extended chars too, extend sign
if C<$20 or C=$7F then
[J:= I; \eliminate char by shifting string down over it
repeat C:= Str(J+1);
Str(J):= C;
J:= J+1;
until C=0;
]
else I:= I+1;
];
];
char String;
[String:= "Hello^M^J World àáâã";
Text(0, String); CrLf(0);
Strip(String, false);
Text(0, String); CrLf(0);
Strip(String, true);
Text(0, String); CrLf(0);
]
```
Output:
```txt
Hello
World àáâã
Hello World àáâã
Hello World
```
## zkl
ASCII
```zkl
var ctlCodes=([1..31].pump(String,"toChar") +(127).toChar());
var extdChars=[127..255].pump(String,"toChar");
var test = "string of ☺☻♥♦⌂, control characters(\t\b\e) and other ilk.♫☼§►↔◄";
test.println("<< test string");
(test-ctlCodes).println("<< no control chars");
(test-extdChars).println("<< no extended chars");
(test-extdChars-ctlCodes).println("<< text");
```
{{out}}
```txt
string of ☺☻♥♦⌂, control characters( and other ilk.♫☼§►↔◄<< test string
string of ☺☻♥♦⌂, control characters() and other ilk.♫☼§►↔◄<< no control chars
string of , control characters(and other ilk.<< no extended chars
string of , control characters() and other ilk.<< text
```
{{omit from|GUISS}}
{{omit from|Openscad}}