$id4 =~ /yesterday(\d+)yesterday/;
my $ans2 = $2 * .40;
$final2 = ($ans2 / 100);

[download]

Jesse Smith: Further to CountZero's reply: in the above quoted and in subsequent steps in the OPed code, the capture variable  $2 (and subsequently  $3 $4) is used in a calculation, but there is no second (or third or fourth) capture group to populate this variable with a defined value. The fact it is undefined would have been made evident to you had you been using warnings (and strictures for good measure – and diagnostics for even better measure since you are learning Perl): 

use warnings;
use strict;
use diagnostics;

[download]

See perlre, perlrequick, perlretut, perlreref for regular expression (re) on-line documentation, or  perldoc perlre etc for local installation documentation.

In reply to Re^2: Search for abcNUMBERdef, make it a variable, then do math? by AnomalousMonk
in thread Search for abcNUMBERdef, make it a variable, then do math? by Jesse Smith

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.