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Ouch. This should be a bit faster. The trick is to do a quick first pass through and count the number of occurrences of each (1st) word, and then go through a 2nd time and output only those lines where $words{$1} == 1.

#!/usr/bin/env perl use 5.012; use warnings FATAL => 'all'; my %words; # Number of times word appears first in a string my @lines = <DATA>; chomp @lines; $words{$_}++ for map { /^(\S+)/ ? $1 : () } @lines; say for grep { /^(\S+)/ ? $words{$1} == 1 : 1 } @lines; __DATA__ hello 1234 5698 7458 hi 1457 7459 6214 good_day 1458 hi 1258 3658 good_morning 4758 hi 1453 oneword hi


hello 1234 5698 7458 good_day 1458 good_morning 4758 oneword

In reply to Re: Removing certain lines from array by rjt
in thread Removing certain lines from array by Dr Manhattan

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