On 2016-01-31 01:56:51, "Steven D'Aprano"
<steve+comp.lang.pyt...@pearwood.info> wrote:
On Sunday 31 January 2016 09:18, Gregory Ewing wrote:
Rustom Mody wrote:
1. One can use string-re's instead of compiled re's
And I gather that string REs are compiled on first use and
cached, so you don't lose much by using them most of the
time.
Correct. The re module keeps a cache of the last N regexes used, for
some
value of N (possibly 10?) so for casual use there's no real point to
pre-
compiling other than fussiness.
In Python 3.5, it's 512.
But if you have an application that makes heavy-duty use of regexes,
e.g.
some sort of parser with dozens of distinct regexes, you might not want
to
rely on the cache.
It's slightly faster to use a pre-compiled regex because it won't have
to look it up in the cache, although most of the time it probably won't
matter.
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