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    <p><strong>Try this</strong></p> <pre><code>(?is)&lt;p&gt;.+?&lt;/p&gt;(?=.*?&lt;/div&gt;) </code></pre> <p><strong>Code</strong></p> <pre><code>$subject =~ s!(?is)&lt;p&gt;.+?&lt;/p&gt;(?=.*?&lt;/div&gt;)!!g; </code></pre> <p><strong>Explanation</strong></p> <pre><code>" (?is) # Match the remainder of the regex with the options: case insensitive (i); dot matches newline (s) &lt;p&gt; # Match the characters “&lt;p&gt;” literally . # Match any single character +? # Between one and unlimited times, as few times as possible, expanding as needed (lazy) &lt;/p&gt; # Match the characters “&lt;/p&gt;” literally (?= # Assert that the regex below can be matched, starting at this position (positive lookahead) . # Match any single character *? # Between zero and unlimited times, as few times as possible, expanding as needed (lazy) &lt;/div&gt; # Match the characters “&lt;/div&gt;” literally ) " </code></pre> <p><strong>UPDATE</strong></p> <p><em>Change your code as follows:</em></p> <pre><code>#!/usr/bin/perl use strict; use warnings; my $string = &lt;&lt;STRING; &lt;div id="main"&gt; hellohello &lt;div id="text"&gt; nokay. &lt;p&gt;This is p1, SHUD B replaced&lt;/p&gt; Alright &lt;p&gt;This is p2, SHUD B replaced&lt;/p&gt; Yes 2 &lt;p&gt;this is P3, SHUD B replaced&lt;/p&gt; Okay done bye &lt;/div&gt; bye &lt;p&gt;this is not under the div whose id is text and SHUDN'T b replaced&lt;/p&gt; &lt;/div&gt; STRING my $str_bak = $string; print "Sring is : \n$string\n\n"; $string =~ s!(?is)&lt;p&gt;.+?&lt;/p&gt;(?=.*?&lt;/div&gt;)!!g;; print "Sring now is : \n$string\n\n"; </code></pre> <hr> <p>And that script gives exactly what is built for. Showing all contents except <code>&lt;p&gt;</code> elements within <code>div</code>.</p>
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    1. POPerl Regular expression to change all patterns in a container
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    1. COThat doesn't do the trick. Any other ideas ? My code is a working example, so you can copy it for testing.
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    2. COChange ``</p1>`` to ``</p>`` in your code and test it [here](http://regexr.com?3134q).
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    3. COIf you add `<div id="text">` to it, nothing matches.
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