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.
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