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#!/usr/bin/env perl
#
...
oldRec:'200[0-3]-\d\d-\d\d
newRec:'20?[4-9]-\d\d-\d\d
newRec2: '201\d-\d\d-\d\d

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$ time perl large_file_regex_search.pl
100000: 1 s
...
-rw-r--r-- 1 Roboticus None  769188466 Jul 21 08:47 FILESRCH.4
-rw-r--r-- 1 Roboticus None          0 Jul 21 08:44 FILESRCH.5
-rw-r--r-- 1 Roboticus None  613214364 Jul 21 08:47 FILESRCH.6