From: Antonio Cangiano <acangiano@...>
Date: 2005-12-21T20:37:49+09:00
Subject: Re: =~ vs match - Some benchmarks.

John Carter wrote:
> While profiling some code I noticed =~, String.match and Regexp.match
> turning up in my hotspots. So here is the results of a little
> benchmarking to resolve which is faster to use... {cut}

> Results on a P4 2.66Ghz using ruby-1.8.3...
> 
> string='as fun as looking for frogs in custard'
> regex=(?-mix:frogs)
>                           user     system      total        real
> string=~/frogs/o      4.390000   1.170000   5.560000 (  5.936591)
> string=~/frogs/       4.390000   1.160000   5.550000 (  6.922374)
> string=~/#{toad}/o    4.450000   1.130000   5.580000 (  7.111464)
> string=~regex         4.850000   1.100000   5.950000 (  8.030837)
> regex=~string         4.690000   1.150000   5.840000 (  7.055707)
> string=~regexo        5.000000   1.120000   6.120000 (  6.471198)
> string=~/#{toad}/    23.750000   1.290000  25.040000 ( 28.654952)
> regex.match           7.180000   1.180000   8.360000 (  9.444980)
> string.match          7.950000   1.170000   9.120000 (  9.726876){cut}

Interesting test, John. :)
My results on a P4 1.8Ghz using ruby-1.8.2 on Linux:

string='as fun as looking for frogs in custard'
regex=(?-mix:frogs)
                           user     system      total        real
string=~/frogs/o      3.650000   0.000000   3.650000 (  3.683330)
string=~/frogs/       3.520000   0.010000   3.530000 (  3.560874)
string=~/#{toad}/o    3.520000   0.010000   3.530000 (  3.612038)
string=~regex         4.110000   0.000000   4.110000 (  4.159460)
regex=~string         3.970000   0.010000   3.980000 (  4.009281)
string=~regexo        4.010000   0.010000   4.020000 (  4.046814)
string=~/#{toad}/    29.650000   0.150000  29.800000 ( 30.071113)
regex.match           6.920000   0.030000   6.950000 (  7.015763)
string.match          8.230000   0.210000   8.440000 (  8.739469)

Antonio