Le 03/01/2012 12:56, Devin Jeanpierre a écrit :
The second assertion sounds more likely. It seems very odd that Python and
Perl implementations are divergent on this point. Any opinion ?
The Python documentation oversimplifies.
You meant Perl Documentation, didn't you ?
It's a commun opinion that non-capturing groups have a price (minor),
for instance Jan Goyvaerts, a well known regular expression guru,
refering to Python code, tells :
non-capturing groups (...) offer (slightly) better performance as the
regex engine doesn't have to keep track of the text matched by
non-capturing groups.
[link is there :
http://stackoverflow.com/questions/2703029/why-regular-expressions-non-capturing-group-is-not-working]
It seems Javascript performs better respect to non-capturing groups :
http://jsperf.com/regex-capture-vs-non-capture
The same for java : http://eyalsch.wordpress.com/2009/05/21/regex/
(no benchmarks).
For my part, Python tests didn't show any kind of significative penality.
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