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Thu Nov 24 16:00:04 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-November/058319.html

Donovan Baarda wrote:

> I don't know if this will help, but in my experience compiling re's
> often takes longer than matching them... are you sure that it's the
> match and not a compile that is taking a long time? Are you using
> pre-compiled re's or are you dynamically generating strings and using
> them?

patterns with nested repeats can behave badly on certain types of non-
matching input. (each repeat is basically a loop, and if you nest enough
loops things can quickly get out of hand, even if the inner loop doesn't
do much...)

</F> 

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