Add keyword proximity validator to data identifier pattern?

Does anyone know if there is a way to do a proximity match between a data identifier pattern and a set of keywords? In other words, give me a match if the number I'm looking for is within X number of words of anything in my keyword list. Could a custom script validator accomplish this perhaps? I've seen this question posed before but I couldn't find a solution, short of including the keywords as part the pattern itself. Is that the only way to do it? Seems like that would be a drag on performance.

Thanks