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If original order doesn't matter try this approach. Broadly, it indexes the array items by using as key the first word. If an key becomes duplicated the item is removed. In detail it uses a hash where keys are the first word of every line in the array. If it tries to add a hash item that does exist (ie, a duplicated key) it sets the hash value to empty string. Finally it filters the hash values discarding those being an empty string.

my @array = ( "hello 1234 5698 7458", "hi 1457 7459 6214", "good_day 1458", "hi 1258 3658", "good_morning 4758", "hi 1453", ); my %indexedArray; my $key; foreach (@array) { $key = (split())[0]; if ( defined $indexedArray{$key} ) { $indexedArray{$key} = ''; } else { $indexedArray{$key} = $_; } } @array = grep(/.+/,values(%indexedArray));

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

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