The advantage of limited over unlimited split is more pronounced if a redundant subroutine call and lexical creation are not included, with regex extraction thrown in for good measure: 

c:\@Work\Perl>perl -wMstrict -le
"use Benchmark qw/cmpthese/;
 ;;
 my $string = '1:13:1:6:5854:0x00E37F06:0x00D1314C';
 my $result;
 ;;
 sub _split {
   $result = join ':', (split /:/, $string)[0 .. 2];
   }
 ;;
 sub _split_LIMIT {
   $result = join ':', (split /:/, $string, 4)[0 .. 2];
   }
 ;;
 sub _regex {
   ($result) = $string =~ m{ \A \d+ : \d+ : \d+ }xmsg;
   }
 ;;
 cmpthese(-5, {
   _split       => \&_split,
   _split_LIMIT => \&_split_LIMIT,
   _regex       => \&_regex,
   });
"
                 Rate       _split _split_LIMIT       _regex
_split       261407/s           --         -39%         -54%
_split_LIMIT 425387/s          63%           --         -24%
_regex       562521/s         115%          32%           --

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In reply to Re^2: Using the Substr by AnomalousMonk
in thread Using the Substr by Anonymous Monk

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