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Re: Re: Common Regex Gotchas

by Anonymous Monk
on May 08, 2001 at 23:26 UTC ( #78934=note: print w/ replies, xml ) Need Help??


in reply to Re: Common Regex Gotchas
in thread Common Regex Gotchas

If I am not mistaken the Benchmark module is plagued by the "$& and friends". That means it makes the regexes slow by defualt. That means that the benchmarks you take are disproportionate and useless, since the ineffectiant single instance of $& ruins any optimizations perl can make on the substitution.


Comment on Re: Re: Common Regex Gotchas
Re: Re: Re: Common Regex Gotchas
by chipmunk (Parson) on May 09, 2001 at 00:30 UTC
    Happily, that doesn't appear to be the case. I don't see any occurence of the $& et al. variables in the code for Benchmark.pm

    The real problem here is the use of /e on the substitution, when this would work just as well and be much more efficient: s/(\w+)/\U$1/g;

      I don't see any occurence of the $& et al. variables in the code for Benchmark.pm

      I think what our Anonymous friend means is that if one of the routines being benchmarked uses $&, then all routines suffer (unfairly) from the overhead.

        I'm pretty sure that the AM was referring to the module itself, especially since none of the code in this thread actually uses $& et al.

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