On 10/11/2013 7:26 AM, David Fishburn wrote:
NFA engine takes almost three times (300 vs 107 seconds) as long to
complete my plugin task.
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Python never makes the top-REGEX engine lists -- can someone remind me
why it was
chosen? Was it purely a case of popularity winning over engineering
design and benchmarks?
From multiple articles the ones with most features and, fastest speed
have been
PCRE engines (perl compatible RegEx... THOUGH the default engine built
into perl isn't among
the fastest).
Comparison websites put the PCRE-w/internal JIT (Just-In-Time state
compiler).
as the fastest by far: http://sljit.sourceforge.net/regex_perf.html
Here is a comparison w/boost, showing boost in front -- but only against
PCRE w/o JIT
the PCRE w/JIT was 2-5x faster than the one without. So.. if Boost was
only 3-5% faster
than the no-JIT PCRE, its' in the dust w/the jit-version.
As far as feature, dunno how up to date this is, but as of when it was
written python didn't even have unicode properties (among other
deficits)...
http://en.wikipedia.org/wiki/Comparison_of_regular_expression_engines
Popularity, has never been a reliable bellwether for 'best'.
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