Removing non alphanumeric characters in a batch variable

Question

In batch, how would I remove all non alphanumeric (a-z,A-Z,0-9,_) characters from a variable?

I\'m pretty sure I need to use findstr and a regex.

Answer 1

@echo eof

call :purge "~~asd123#()%%%^"^!^"~~~^:^=asd^>^  . '  [ ] { }  ` ^| ^"  ) do (
   set "str1=!str1:%%a=!"
 )

 rem dealing with some delimiters


 set "str1=!str1:(=!"
 set "str1=!str1:)=!"
 set "str1=!str1:;=!"
 set "str1=!str1:,=!"
 set "str1=!str1:^^=!"
 set "str1=!str1:^~=!"

 set "temp_str=" 
 for %%e in (%str1%) do (
  set "temp_str=!temp_str!%%e"
 )

endlocal & set "str1=%temp_str%"



setlocal disableDelayedExpansion
set "str1=%str1:!=%"
set "str1=%str1::=%"
set "str1=%str1:^^~=%"

for /f "tokens=* delims=~" %%w in ("%str1%") do set "str1=%%w"

endlocal & set "str1=%str1%"



endlocal &  if "%~2" neq "" (set %~2=%str1%) else echo %str1%

goto :eof

Still cannot deal with ~ and = but working on it

EDIT: = now will be cleared EDIT: ~ now will be cleared