[issue6650] sre_parse contains a confusing generic error message

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

In the absence of better propositions, the message in the patch seems more helpful to me than the previous, especially because “lookbehind” is a search term that matches <0.1 wink> on docs.python.org. So I’d apply this patch.

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nosy: +merwok

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