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How do I replace a block of text using regular expressions in Perl?

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Last Modified: 2013-12-25
I have the following subroutine reading the content of a text file template

sub readfile {
   open(INFILE,"$_[0]");
   flock(INFILE,2);
   my @content=<INFILE>;
   flock(INFILE,8);
   close(INFILE);
   return @content;
}

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The template contains block of content I would like to replace, from <!--tmpl_start--> to <!--tmpl_end--> where anything can possibly go in between.

It would be easy to use a foreach loop if they are on the same line.

How do I implement this if they're on different lines?
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