how to search and replace case sensitive string using batch

Question

I want to search and replace case sensitive string

like if I have rise Rise RISE in a text file I only want to replace string \"rise\" the code below is replace a

Answer 1

We all know that Batch files have multiple restrictions, so the creation of general purpose solutions is difficult. Because of this, I always try to fullfill the particular requirements of a certain given problem first. If this is possible, then the limitations of Batch to provide a more general solution for other similar problems that are NOT currently being requested by someone don't matters, right?

The Batch file below do a case-sensitive replacement of one string by another one and it is very fast, but it fail in lines that contain the original string written MORE THAN ONCE in different case combinations, including the target one. I think this method is enough for most users that have this requirement.

@echo off
setlocal EnableDelayedExpansion

set /P "file=Enter file name: "
set /P "OldStr=Enter original text: "
set /P "NewStr=Enter new text: "

rem Get list of numbers of matching lines to replace
set n=0
for /F "delims=:" %%a in ('findstr /N /C:"%OldStr%" "%file%"') do (
   set /A n+=1
   set replace[!n!]=%%a
)
if %n% equ 0 (
   echo Original text not found in file
   goto :EOF
)
set /A n+=1
set replace[%n%]=0

rem Process all lines in the file
setlocal DisableDelayedExpansion
set i=1
(for /F "tokens=1* delims=:" %%a in ('findstr /N "^" "%file%"') do (
   set line=
   set "line=%%b"
   setlocal EnableDelayedExpansion
   rem If this line have the original string...
   for %%i in (!i!) do if %%a equ !replace[%%i]! (
      rem ... replace it and advance to next matching line number
      echo !line:%OldStr%=%NewStr%!
      endlocal & set /A i=%%i+1
   ) else (
      echo(!line!
      endlocal
   )
)) > "%file%_new.txt
rem If you want to replace the original file, remove REM from next line:
REM move /Y "%file%_new.txt" "%file%"

For example, this input file:

This line is not changed: Rise. 
No problem with special characters: & | < > ! " ^ 
This line is changed: rise
This line is not changed: RISE
This line is incorrectly changed: Rise & rise

with a replacement of "rise" by "New Text", produce:

This line is not changed: Rise. 
No problem with special characters: & | < > ! " ^ 
This line is changed: New Text
This line is not changed: RISE
This line is incorrectly changed: New Text & New Text