Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment:

"(?![a-z0-9])" is a negative lookahead, so "(?![a-z0-9])0" is saying
that the next character shouldn't be any of [a-z0-9], yet it should
match "0". Hence, no matches.

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nosy: +mrabarnett

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue6797>
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