<https://w3schools.invisionzone.com/topic/32997-changing-an-eregi-regular-expression-to-work-with-preg_match/>
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"changing an eregi regular expression to work with preg_match"
<https://w3schools.invisionzone.com/topic/32997-changing-an-eregi-regular-expression-to-work-with-preg_match/?do=reportComment&comment=180801>