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<?php echo filter_var('denis.cutic@gmail.com', FILTER_VALIDATE_REGEXP, array("options" => array("regexp" => "/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+[a-zA-Z0-9]{2,4}$/"))); ?>
Output for git.master, git.master_jit, rfc.property-hooks
denis.cutic@gmail.com

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