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You would probably need to catch repititions of more than 3 instances (2 being common enough). You would need to build a function that looks at a string value and checks it for more than 3 occurances of every letter of the alphabet.
What kept coming into my mind was would it not be better to give your users an "are you sure" page. They fill out all the fields in your form, click next (or whatever) and then present them with a summary of the information that they have filled in (similarly to Amazon)?
BlobFisk - it's not really a standard form situation I'm using - it's a javascript timer based thingy. My current attempt involves looking at repetitions that occur very close together - it's nearly impossible to type repetitions as fast as the repeater, so it should really be able to pick it up.