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Re^4: Unefficient Regexp 'Matching this or that'

by pelagic (Curate)
on May 19, 2010 at 09:12 UTC ( #840646=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Unefficient Regexp 'Matching this or that'
in thread Unefficient Regexp 'Matching this or that'

Thanks for your hints!
I did some more testing now:

one_string      /00901808/
two_string      /00901808|87654321/
four_string     /00901808|87654321|12345678|29586741/
2_grep_string   programmed loop over list of 2 regexps
4_grep_string   programmed loop over list of 4 regexps
> perl bench_regexp 100000lines.92MB.file Benchmark: timing 1 iterations of 2_grep_string, 4_grep_string, four_s +tring, one_string, two_string... Matched records: 1 2_grep_string: 3 wallclock secs ( 2.91 usr + 0.44 sys = 3.35 CPU) @ + 0.30/s (n=1) (warning: too few iterations for a reliable count) Matched records: 1 4_grep_string: 4 wallclock secs ( 3.56 usr + 0.42 sys = 3.98 CPU) @ + 0.25/s (n=1) (warning: too few iterations for a reliable count) Matched records: 1 four_string: 100 wallclock secs (98.83 usr + 0.56 sys = 99.39 CPU) @ + 0.01/s (n=1) (warning: too few iterations for a reliable count) Matched records: 1 one_string: 2 wallclock secs ( 1.62 usr + 0.40 sys = 2.02 CPU) @ 0 +.50/s (n=1) (warning: too few iterations for a reliable count) Matched records: 1 two_string: 75 wallclock secs (73.87 usr + 0.53 sys = 74.40 CPU) @ 0 +.01/s (n=1) (warning: too few iterations for a reliable count)

pelagic


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