Re^3: match a word and delete last line

Try this, but your question is a little unclear. Please give an exact input and output test case, not a partial one.

#!/usr/bin/perl

# http://perlmonks.org/?node_id=1190966

use strict;
use warnings;

$_ = do { local $/; <DATA> };

s/^(\w+(?:[-_]\d+)?)\n(?=.*\1\b)//gm;

print;

__DATA__
Text_1
sample-text file Text_1
 matching the 1st line
 matching the last line
Text
text_1
text-2
sample-text file text-2
 matching the 1st line
 matching the last line
text_1
text-2
text
sample-text file text
 matching the 1st line
 matching the last line
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Comment on Re^3: match a word and delete last line Download Code

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Re^4: match a word and delete last line by ArifS (Beadle) on May 23, 2017 at 14:23 UTC
That works. I was missing (?: ). Thank you.	[reply]