Code help?

I have been working on a program but it needs some thing so if it finds code eny where in the file like this for Eg: say("test") and maybe run it as print("") no matter what the text is can eny one help?

I think something like this was asked recently, check out to see if there's an answer.
I would recommend to take a look at the lua string library. The find, match and gmatch functions might be usefull for this.