Nice try, but that was not my use case. I only multiplied the int part to prove I could do it from the CODE part of s///. Now let's say that IS my use case, that I want to multiply AND commify WITHOUT grouping, and the real number MUST be in a string, as in hippo's test paradigm, to wit:

   $orig = 'This is a real number, 123456.56567';
   $want = 'This is a real number, 493,826.26268';

I can do it with mine but not yours, as in:

$want = 'This is a real number, 493,826.26268';
($have = (($orig) =~ s{ \d+\.?\d* }{ $& * 4 }erx )) =~ s{ \d+ }{
    $& =~ s/ (?<=\d) (?= (?:\d{3} )+ (?!\d) ) /,/xrg; }ex;
$intpart = $&;
is $intpart, 493826, '$& int part captured';
is $have, $want, 'Insert commas where appropriate';

[download]

And as the Monks prefer, no grouping () to be seen. That is three s/// in a one-liner. First, grab the real number and factor it; next, grab just the int part and commify it; finally, put it back in the string. Man, s/PATTERN/CODE/e is potent mojo.

In reply to Re^6: regex in REPLACEMENT in s/// by perlboy_emeritus
in thread regex in REPLACEMENT in s/// by perlboy_emeritus

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.