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It isn't a trivial process. "Its" and "It's" aren't the same thing. "It's" represents two words. Test and testing are, truly, variations of the same word. Generally, depending upon the purpose of the task, people back off their requirements an appropriate amount. Running the GNU license through your processor will highlight the sort of thing I mean. I would venture to say that the use of regular expressions is an overkill, regardless of goal, and will slow the process down considerably.
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