function _validateCubicBezierParams(match) {
        var x1 = _convertToNumber(match[1]),
            y1 = _convertToNumber(match[2]),
            x2 = _convertToNumber(match[3]),
            y2 = _convertToNumber(match[4]);

        // Verify all params are numbers
        if (!x1.isNumber || !y1.isNumber || !x2.isNumber || !y2.isNumber) {
            return false;
        }

        // Verify x params are in 0-1 range
        if (x1.value < 0 || x1.value > 1 || x2.value < 0 || x2.value > 1) {
            return false;
        }

        return true;
    }
Validate cubic-bezier function parameters that are not already validated by regex:

@param {RegExp.match} match  RegExp Match object with cubic-bezier function parameters
                             in array positions 1-4.
@return {boolean} true if all parameters are valid, otherwise, false