Disallowed Key Characters

// File: system/core/input.php
// Line : 728
// Problem with coookie Google analytics
// replace _clean_input_keys function
// Disallowed Key Characters. __utmt_~1


function _clean_input_keys($str)
	{
		if ( ! preg_match("/^[a-z0-9:~_\/-]+$/i", $str))
		{
			exit('Disallowed Key Characters.');
		}

		// Clean UTF-8 if supported
		if (UTF8_ENABLED === TRUE)
		{
			$str = $this->uni->clean_string($str);
		}

		return $str;
	}