If you are trying to match an exact substring then there is usually little point in using regex for that. I would use index instead.

use strict;
use warnings;
use Test::More tests => 1;

my $corpus = q{foo<span class="Trsdu(0.3s) Fw(b) Fz(36px) Mb(-4px) D(i
+b)" data-reactid="33">bar};
my $lookfor = q{<span class="Trsdu(0.3s) Fw(b) Fz(36px) Mb(-4px) D(ib)
+" data-reactid="33">};

my $res = index ($corpus, $lookfor) > -1 ? 1 : 0;
ok $res, 'Substring found';

[download]

Update: Replacing the ternary with a simple increment gives us more info in $res with the same testing ability. Adding a negative test too gives the better example:

use strict;
use warnings;
use Test::More tests => 2;

my $corpus = q{foo<span class="Trsdu(0.3s) Fw(b) Fz(36px) Mb(-4px) D(i
+b)" data-reactid="33">bar};
my $lookfor = q{<span class="Trsdu(0.3s) Fw(b) Fz(36px) Mb(-4px) D(ib)
+" data-reactid="33">};

my $res = index ($corpus, $lookfor) + 1;
ok $res, 'Substring found';

$corpus = 'Something else';
$res = index ($corpus, $lookfor) + 1;
ok !$res, 'Substring not found';

[download]

In reply to Re: Regular Expression Help by hippo
in thread Regular Expression Help by vskatusa

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.