<?php var_dump(preg_match('/^[a-zA-Z0-9,. ]*$/', 'xx,yy')); var_dump(preg_match('/^[a-zA-Z0-9,. ]*$/', 'xx yy')); var_dump(preg_match('/^[a-zA-Z0-9,. ]*$/', 'xx.yy'));
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