Hi,
there is simple but straightforward "Benchmark of Regex Libraries" at
http://lh3lh3.users.sourceforge.net/reb.shtml
I measured search durations for both regexp engines in Vim 7.3.1010,
using the same regular expressions and the same data they used. I added
one simpler test, which is listed in the final column ("Word") below.
Please refer to that web site for more information.
URI Email Date Sum3 URI|Email Word
re=1 16.34 13.65 4.07 34.06 29.46 0.49
re=2 92.03 9.75 4.47 106.25 105.39 5.22
Python 2.7.3 2.69 5.17 1.01 8.87 7.72 3.40
Perl 5.14.2 0.35 0.33 0.32 1.00 8.12 0.31
GNU egrep 2.10 0.21 0.16 0.56 0.93 10.86 0.03
The figures (in s) are averages of five runs each, on Linux, 64-bit
i7-2700K CPU @ 3.50GHz x 8. (The Python, Perl, and egrep figures are
just for comparison with the original benchmark.)
I made a gist with the necessary materials here:
https://gist.github.com/glts/5646749
Best,
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