function _fnEscapeRegex ( sVal )
	{
		var acEscape = [ '/', '.', '*', '+', '?', '|', '(', ')', '[', ']', '{', '}', '\\', '$', '^', '-' ];
		var reReplace = new RegExp( '(\\' + acEscape.join('|\\') + ')', 'g' );
		return sVal.replace(reReplace, '\\$1');
	}
scape a string such that it can be used in a regular expression
 @param {string} sVal string to escape
 @returns {string} escaped string
 @memberof DataTable#oApi