With the /x modifier: 
my $re = qr{
      "[^"]*"   # first quoted string = URL
       ...      # more stuff
}x

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In reply to Re: comment inside perl regular expression by moritz
in thread comment inside perl regular expression by vinoth.ree

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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