I guess I don't understand regular expression switches as well as I should.

What I am trying to do is dynamically create the pattern tested against within a regular expression. The code below attempts to show what I'm wanting to do.

#!/usr/bin/perl my $s = 'Tue Feb 8 11:11:11 2005: blah blah blah'; my $regex = '/^$wday $mon\s+$mday \d{2}:\d{2}:\d{2} $year:'; my $wday = 'Tue'; my $mon = 'Feb'; my $mday = '8'; my $year = '2005'; findString($s); sub findString($) { my $line = shift; print "found\n" if $line =~ /$regex/; }

However, executing this script doesn't output anything where as I was thinking that it should. What switch(es) am I missing?

Any insight you care to pass on would be greatly appreciated. Thanks.


In reply to string substitution within regular expressions? 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.