[Tim] >> Is that a feature? Or an accident? It's very surprising to find a >> non-empty match inside an empty match (the outermost lookahead >> assertion).
[Paul Moore] > Personally, I would read (?=(R))" as finding an empty match at a point > where R starts. There's no implication that R is in any sense "inside" > the match. > > (?=(\<\w\w\w\w\w\w)\w\w\w) finds the first 3 characters of words that > are 6 or more characters long. Once again, the lookahead extends > beyond the extent of the main match. > > It's obscure and a little bizarre, but I'd say its intended and a > logical consequence of the definitions. After sleeping on it, I woke up a lot less surprised. You'd think that after decades of regexps, I'd be used to that by now ;-) Thanks for the response! Your points sound valid to me, and I agree. _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
