#!/usr/bin/perl -w

use Benchmark 'timethese';
use strict;

print "split: ", use_split(), "\n";
print "regex: ", use_regex(), "\n";

sub use_split {
	$_ = "  one two three    four five six";
	split;		# See Jouke's post (this may be faster). This is deprecated though.
	return $_[3];
}

sub use_regex {
	$_ = "  one two three    four five six";
	s/^\s+//;
	m/^(?:[^\s]+\s+){3}([^\s]+)/;
	return $1;
}

timethese(-10, {        regex => \&use_regex,
                        split => \&use_split });
timethese(-50, {        regex => \&use_regex,
                        split => \&use_split });
timethese(-100, {       regex => \&use_regex,
                        split => \&use_split });

##</code><code>##

Benchmark: running regex, split, each for at least 10 CPU seconds...
     regex: 12 wallclock secs (10.64 usr +  0.00 sys = 10.64 CPU) @ 40522.18/s (n=431156)
     split: 10 wallclock secs (10.02 usr +  0.00 sys = 10.02 CPU) @ 37290.82/s (n=373654)

##</code><code>##

Benchmark: running regex, split, each for at least 50 CPU seconds...
     regex: 68 wallclock secs (54.11 usr +  0.13 sys = 54.24 CPU) @ 40957.93/s (n=2221558)
     split: 56 wallclock secs (49.95 usr +  0.05 sys = 50.00 CPU) @ 38128.48/s (n=1906424)

##</code><code>##

Benchmark: running regex, split, each for at least 100 CPU seconds...
     regex: 136 wallclock secs (110.38 usr +  0.32 sys = 110.70 CPU) @ 40548.93/s (n=4488766)
     split: 112 wallclock secs (100.00 usr +  0.02 sys = 100.02 CPU) @ 38995.86/s (n=3900366)