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12345: 12:34:00,890,987,9876,... 12346: 12:35:02,789,987,234,... 12344: 12:35:04,345,987,1234,... etc.
LINE: while (<THATFILE>) { next LINE if (!/^\d+: \d{2}:/ ); ... chomp $field; if ($field == '987') { foreach $subtime (split /:/, $field) {