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<?php var_dump(preg_match('/www\.tableau(software)?.com$/', 'www.tableausoftware.com')); var_dump(preg_match('/www\.tableau(software)?.com$/', 'www.tableau.com')); var_dump(preg_match('/www\.tableau(software)?.com$/', 'kb.tableausoftware.com')); var_dump(preg_match('/www\.tableau(software)?.com$/', 'not.tableauprod.net')); var_dump(preg_match('/www\.tableau(software)?.com$/', 'tab.local'));

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