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    <p>Here is an another option to figure out what it is doing. Use the module <a href="http://search.cpan.org/~gsullivan/YAPE-Regex-Explain-4.01/Explain.pm" rel="nofollow">YAPE::Regex::Explain</a> from CPAN.</p> <p>Using it in this fashion (This is just the match part of the search and replace):</p> <pre><code>use strict; use YAPE::Regex::Explain; print YAPE::Regex::Explain-&gt;new(qr/\w&lt;([^&gt;]+)&gt;/)-&gt;explain(); </code></pre> <p>Will give this output: </p> <pre><code>The regular expression: (?-imsx:\w&lt;([^&gt;]+)&gt;) matches as follows: NODE EXPLANATION ---------------------------------------------------------------------- (?-imsx: group, but do not capture (case-sensitive) (with ^ and $ matching normally) (with . not matching \n) (matching whitespace and # normally): ---------------------------------------------------------------------- \w word characters (a-z, A-Z, 0-9, _) ---------------------------------------------------------------------- &lt; '&lt;' ---------------------------------------------------------------------- ( group and capture to \1: ---------------------------------------------------------------------- [^&gt;]+ any character except: '&gt;' (1 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ) end of \1 ---------------------------------------------------------------------- &gt; '&gt;' ---------------------------------------------------------------------- ) end of grouping ---------------------------------------------------------------------- </code></pre> <p>The substitute part of the expression is stating that the match which was made earlier between "group and capture to \1" and "end of \1" should be converted to uppercase.</p>
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