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    <p>This would replace everything between Line 1 and 2 (even <strong>nothing</strong>) by insert:</p> <pre><code>... open my $in, '&lt;', 'myfile.txt' or die "myfile.txt: $!"; my $content = do { undef $/; &lt;$in&gt; }; close $in; # Set strings to find and insert my $first_line = quotemeta 'A'; my $second_line = quotemeta 'B'; my $insert = 'hello world'; # Insert our text $content =~ s/(?&lt;=$first_line) .*? (?=$second_line)/\n$insert\n/xs; # Write output to output.txt open my $out, '&gt;', 'output.txt' or die "output.txt: $!"; print $out $content; close $out; ... </code></pre> <hr /> <p><strong>Edit/Addendum</strong></p> <p>After reading your <a href="https://stackoverflow.com/questions/3458194/sed-or-perl-inserting-text-between-two-lines">"enhanced specification"</a>, its much clearer how to solve this. You include the Start (^) and End ($) of the lines into the regular expression. In order to keep this maintainable, I did take out the expression and made a variable of it. I tested it and it seems to work (even with '(') and stuff):</p> <pre><code>... # modified part # Set strings to find and insert my $first_line = quotemeta ')'; my $second_line = quotemeta 'NIC Hr_Nic ('; # you won't need an array here, just write the lines down my $insert = 'haattr -add RVG StorageRVG -string haattr -add RVG StorageDG -string haattr -add RVG StorageHostIds -string haattr -delete RVG Primary haattr -delete RVG SRL haattr -delete RVG RLinks'; my $expr = qr{ (?&lt;=^$first_line$) (\s+) (?=^$second_line$) }xms; # Insert our text $content =~ s/$expr/\n$insert\n/; ... </code></pre> <p>I created such a file:</p> <pre><code>stuff stuff ) NIC Hr_Nic ( stuff stuff </code></pre> <p>and it got inserted properly.</p> <p>Regards</p> <p>rbo</p>
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    1. COhi rubber can you advice what quotemeta mean ?
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    2. COlidia, quotemeta does on string what \Q..\E does in regular expressions, is /masks/ the special chars from external input (files etc.) so that they won't contain control chars for regular expressions. If possible, don't use \Q..\E in the regex - better prepare the strings before by quotemeta.
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    3. COcan I use @array in place $insert parameter?
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