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That seems to work. !5 seconds instead of 53 for the alternation is much more reasonable. Still doesn't beat the two pass method, but there is probably a break point somewhere.

c:\test>junk31 836952.log Benchmark: timing 1 iterations of AAtwo_pass, BBtwo_string, CCone_string ... two pass: 10 AAtwo_pass: 7 wallclock secs ( 5.60 usr + 0.83 sys = 6.43 CPU) @ 0 +.16/s (n=1) (warning: too few iterations for a reliable count) two string: 10 BBtwo_string: 15 wallclock secs (14.35 usr + 0.94 sys = 15.29 CPU) @ + 0.07/s (n=1) (warning: too few iterations for a reliable count) one string: 7 CCone_string: 16 wallclock secs (14.76 usr + 0.73 sys = 15.49 CPU) @ + 0.06/s (n=1) (warning: too few iterations for a reliable count)

I'm still puzzled why the two pass takes less time than the one string, but the numbers are right and I can't anything major wrong with the benchmark?

In reply to Re^3: Unefficient Regexp 'Matching this or that' by BrowserUk
in thread Unefficient Regexp 'Matching this or that' by pelagic

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