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<?php $query = "2+ 2"; if(preg_match('/(\d+)(\s)*([+/*-])(\s)*(\d+)/', $query)){ echo "<div class=\"calc\">Mathematical Operation</div>"; } ?>
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Unknown modifier '*' in /in/2VTN1 on line 3

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