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Does String1 begin with String2?

Check if one string starts with another.

Description: Knowing a certain character combination that never occurs in string1 can help solving the exercise. Lets say @@@ never occurs in string1 then we can use it as prefix for string1 and reformulate the question to: Does string1 alter if we delete any occurrence of @@@+string2 within string1. If string1 alters then if string1 start string2 then string 1 will alter otherwise not.
Script:
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 SETLOCAL ENABLEDELAYEDEXPANSION
set s=@@@%string1%
if "%s%"=="!s:@@@%string2%=!" (
    echo.string1 doesn`t begin with string2
) ELSE (
    echo.string1 begins with string2
)