my $test_string= '12345';

print "$1\n" if ($test_string=~ /(2)/g);  #Actually printed 2
print "$1\n" while ($test_string=~ /\G(\d)/g);# Printed every thing af
+ter 2 i.e 3,4,5

[download]

Thanks Anomalous for this explanation. If I understand you correctly then essentially you mean \G is a kind of anchor (like ^ and $) but instead of having a fixed location, its position depends on where last match happened. As in my code above first print statement printed only 2 and then for next print statement pattern match started in the string from location next to 2 so 3,4,5 matched.I hope my understanding is correct so far.

Can you tell me what would be the scope of \G. Supposes in next print statement I use a different string, then also \G would will make pattern match to start from a position where it last matched in string one? what if second string is smaller than string in first print line and \G has a value greater than second string size?

In reply to Re^6: Regular expression by pravakta
in thread Regular expression by pravakta

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.