Excerpt from the Regular Expression HOWTO
(http://docs.python.org/howto/regex.html#non-capturing-and-named-groups) :
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It should be mentioned that there’s no performance difference in
searching between capturing and non-capturing groups; neither form is
any faster than the other.
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Now from the Perl Regular Expression tutorial
(http://perldoc.perl.org/perlretut.html#Non-capturing-groupings) :
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Because there is no extraction, non-capturing groupings are faster than
capturing groupings.
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The second assertion sounds more likely. It seems very odd that Python
and Perl implementations are divergent on this point. Any opinion ?
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