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The $4 seems not to be necessary,
Indeed, as long as you use (?:\w+\W+){0,$distance} instead of the expression I've used, (\w+\W+){0,$distance} there will be no extra match. I haven't done any benchmarking, but probably the lookahead is a bit better/faster anyway. In reply to Re^5: Problems searching and highlighting proximity words in a text
by Krambambuli
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