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Perhaps the following will work for you:

use strict; use warnings; my ( @array, %seen ); while ( my $line = <DATA> ) { if ( $line =~ /(amazing\.\S+)/ and not $seen{ lc $1 }++ ) { push @array, $line; #print $line; } } print for @array; __DATA__ Today is amazing.nice day Today is amazing.nice but still I haven't done anything Yesterday was just a normal day Tomorrow probably will be amazing.new day

Output:

Today is amazing.nice day Tomorrow probably will be amazing.new day

$1 captures amazing\.\S+ and using lc on the hash key helps insure case is not significant in uniqueness.

Hope this helps!


In reply to Re: How to ignore lines that match certain string after it is matched for the first time within a same file by Kenosis
in thread How to ignore lines that match certain string after it is matched for the first time within a same file by Ben328

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