And as usual grep EXPR, LIST that everyone forgets about wins the race. 

#!/usr/bin/perl
use strict;
use warnings;

my @values = qw(test test1 test2 test3);

use Benchmark qw( cmpthese );

cmpthese -2, {
    for_loop  => sub { my @matches; for (@values) { push @matches, $_ 
+if $_ =~ /test/ }; },
    grep_loop => sub { my @matches = grep { $_ =~ /test/ } @values;   
+                   },
    grep_expr => sub { my @matches = grep $_ =~ /test/, @values       
+                   },
};
__END__
              Rate grep_loop  for_loop grep_expr
grep_loop 248507/s        --      -27%      -46%
for_loop  338839/s       36%        --      -27%
grep_expr 461521/s       86%       36%        --

[download]

You owe the oracle a Battle Royale With Cheese and a tasty drink to wash it down with.

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re^3: Battle Royal Grep vs For by Fletch
in thread Battle Royal Grep vs For by Herkum

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.