perl -MO=Deparse
my $number = '..2314-1234123.'; if ($number =~ /\d/ * /^([\d.-]+)$/) { print "$1\n"; }
The original trick is multiplying the first regex result (as a scalar) by the second regex result (as a scalar). That is, 1*1 is true, but 0*1 is false.

However, since the two regexen aren't being bound to $number in your example, the code actually doesn't work. The second regex is searching $_ for matches instead.

--
[ e d @ h a l l e y . c c ]


In reply to Re: Re: Re: Golf this reg ex by halley
in thread Golf this reg ex by bradcathey

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.