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Before i thought mastering regexp were a must to have in a day to day programmer job to quickly modify data with different syntax.

Now i am still convinced that regexp are still usefull but you will not get it right for the first try due to syntax corner case. The best solution in my opinion is to have easy to use parsers including one for your main programming language.

Actually i emacs with its macro feature (not elisp) + racket with regexp (didn't mention earlier but having a strong repl for this kind of incremental script is also a must to have) and sometimes parsers.