: 2009-02-10 19:56:05 (C:/Perl510/bin/perl regex_test.pl)
    Perl 5.10.0 on MSWin32:
    $ARGV = {
            'WHEN' => '12:34'
            };
    $string = 'It is thyme';

    : 2009-02-10 19:56:05 (perl regex_test.pl)
    Perl 5.10.0 on cygwin:
    $ARGV = {
            'WHEN' => undef
            };
    $string = 'It is thyme';