This formula is simpler than the one earlier. The main insight here is to avoid strings; it is better to use arithmetic addition to construct the 'year' string (i.e. 20xx) . 
for ( my @dates = qw( 4-10-31 14-11-31 ) ) {
        s/
        ^
        (\d{1,2})
        ((?:-\d{1,2}){2})
        $
        /(2000+$1).$+/xe
        and print;
}

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In reply to Re^2: need regular expression by ioannis
in thread need regular expression by jesuashok

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