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You can't. glob() supports very limited regex, so glob for what you need like *.jpg and then when you loop through the array use a strpos() or preg_match() to eliminate the ones you don't want.
mysql_function(): WARNING: This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQLextension should be used. See also MySQL: choosing an API guide and related FAQ for more information.