That'll teach me to try and one-line my original solution.:(

For what it's worth, I didn't say that the last one would be more efficient, but I did say it would work ;(.

The original was 

#! perl -sw
use strict;

my $var = "xxx:12345 yyy:54321 zzz:13245";
my $p=0;
do {
    ($p=index($var, ':', $p+1 )) > -1 
    and print substr( $var, $p-3,3),$/;
} while ($p > -1);

[download]

but I didn't like the double test against -1, so I tried to get rid of it. Don't know how I missed that it printed the extra one. A case of seeing what I wanted to see I guess.

I'm not that surprised that doing the looping inside the regex engine is more efficient than at user level. I'm guessing that it makes a single pass looking for fixed anchors like the : when the /g options is used. I am surprised how much more efficient it is.

Nice benchmark BTW. Something I need to get better at.

Cor! Like yer ring! ... HALO dammit! ... 'Ave it yer way! Hal-lo, Mister la-de-da. ... Like yer ring!

In reply to Re: Re2: split question by BrowserUk
in thread split question by Anonymous Monk

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.