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Two problems:

  • Missing space in <!--Start_of_revision-->
  • if rather than while

    A working version of your code in a form that is better for stand alone testing is:

    use strict; use warnings; my $text = join "", <DATA>; while($text =~ /<!-- Start_of_revision-->(.*?)<!-- End_of_revision-->/ +sg) { print $1; } __DATA__ <!-- Start_of_revision--> revision1 <!-- End_of_revision--> <!-- Start_of_revision--> revision2 <!-- End_of_revision--> <!-- Start_of_revision--> revision3 <!-- End_of_revision-->
    revision1 revision2 revision3

    Perl is Huffman encoded by design.

    In reply to Re: Regular expressions by GrandFather
    in thread Regular expressions by Anonymous Monk

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