[docs] [issue18562] Regex howto: revision pass

[Antoine Pitrou]

Antoine Pitrou added the comment:

Well, this is already too long IMO. Two sentences should suffice. If you are calling a regex very often in a loop, then it makes sense to compile it. Otherwise, don't bother.

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nosy: +pitrou

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<http://bugs.python.org/issue18562>
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