From perldoc -f pos: 
     pos SCALAR

     pos

     Returns the offset of where the last C<m//g> search
     left off for the variable is in question (C<$_> is
     used when the variable is not specified).  May be
     modified to change that offset.  Such modification
     will also influence the C<\G> zero-width assertion in
     regular expressions.  See L<perlre> and L<perlop>.

[download]
If you want the position in the string where the match *starts* (rather than where it left off, as pos gives you), you could use 
    pos() - length $&

[download]
or something. For example: 
    my $R = "foo bar quux baz";
    while ($R =~ /ba.\b/g) {
        print pos($R) - length $&, "\n";
    }

[download]
Prints: 
    4
    13

[download]

In reply to Re: index with regex by btrott
in thread index with regex by Dogg

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.