I have a question with regards to variable substring substitution in an NT batch program. For example, the following piece of code works as expected and replaces 'ab' with 'xy'. ::Edit and replace the character string 'ab' with 'xy' SET v_test=123abcd Set v_replacement=xy SET v_result=%v_test:ab=xy% ECHO %v_result% = 123xycd How can I perform the substitution, when the replacement string is a variable instead of the contant string 'xy' i.e. I want to replace 'ab' with the contents of the variable %v_replacement%, instead of the hardcoded value 'xy' ? Thanks.

The command prompt as to be executed with ENABLEDELAYEDEXPANSION for the code below to work. 1, Right click the "Command Prompt" as add the "/v" in the Target box as below. and run the code. %SystemRoot%\system32\cmd.exe /v Tested with WinXP Pro. @echo off SET v_test=123abcd Set v_replacement=xy SET v_result=%v_test:ab=!v_replacement!% ECHO %v_result%=123xycd