That having been said, if you come to the realization that you're better-off doing the sanity check in a cleaner language, and simply re-painting the form with badly-formed fields noted (red is usually a good color for this sort of thing) while carrying over the valid form fields as "sticky" values, then you will have the luxury of using URI, which is a very clean, easy-to-use module that should handle more URI issues than you're likely to throw at it.
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