#!/usr/bin/perl # use strict; use warnings; my $inputFile = q{spw888564.txt}; open my $inputFH, q{<}, $inputFile or die qq{open: < $inputFile: $!\n}; while ( <$inputFH> ) { next unless m{(\w+).*\b\1\b}; print qq{Found '$1' repeated in: $_}; } close $inputFH or die qq{close: < $inputFile: $!\n};