Escaping an equals sign in DOS batch string replacement command

Question

I need to replace some text in a JNLP file using a DOS batch file to tune it for the local machine.

The problem is that the search pattern contains an equals sign wh

Answer 1

The best solution is to download and install Cygwin or GNUWin32 but, if you're really limited to the standard command processor, it can get a little messy.

This is not the fastest method in the world but it's at least functional. This command file processes each line one character at a time, treating specially the case where you find the stanza you're looking for.

@echo off
set init=50M
set max=75M
setlocal enableextensions enabledelayedexpansion
for /f "tokens=* delims=" %%a in (agility.jnlp) do (
    set str1=%%a
    call :morph
    echo !str2!>>agility_new.jnlp
    echo !str2!
)
endlocal
goto :eof

:morph
    set str2=
:morph1
    if not "x!str1!"=="x" (
        if "!str1:~0,18!"=="initial-heap-size=" (
            set str2=!str2!initial-heap-size="!init!"
            set str1=!str1:~24!
            goto :morph1
        )
        if "!str1:~0,14!"=="max-heap-size=" (
            set str2=!str2!max-heap-size="!max!"
            set str1=!str1:~20!
            goto :morph1
        )
        set str2=!str2!!str1:~0,1!
        set str1=!str1:~1!
        goto :morph1
    )
    goto :eof

With the input file:

next line
===

you end up with:

next line
===