How would you redefine Perl regexes to do this?

But the  (?:[^\1]*) construct was envisioned to get around the lack of variable-width positive/negative lookbehind; I think I'd just implement that. (Of course, I suspect the reason it hasn't been implemented yet is because it's a royal pain to do so. Perhaps best to be careful what you wish for lest you find yourself with a new and very difficult assignment. As for implementing ferkcabs, I think I'd switch to another profession first. :)

Give a man a fish:  <%-{-{-{-<

In reply to Re^4: Regex: matching character which happens exactly once by AnomalousMonk
in thread Regex: matching character which happens exactly once by LanX

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