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I did this interactively after I had the same behaviour
in my script.

    Lua 5.1.4  Copyright (C) 1994-2008, PUC-Rio
    > a="find(test)"
    > =string.find(a,"test")
    6	9
    > =string.find(a,"(" )
    stdin:1: unfinished capture
    stack traceback:
        [C]: in function 'find'
        stdin:1: in main chunk
        [C]: ?

Why does string.find find the word "test" but not the "(" ?

Best regards,