RGBStringToColor = function (rgb)
{
    var color = new Color();

    var result = (/^rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(?:,\s*(\d+(?:\.\d+)?))?\s*\)$/).exec(rgb.toLowerCase());

    if (result)
    {
        var r = parseInt(result[1], 10);
        var g = parseInt(result[2], 10);
        var b = parseInt(result[3], 10);
        var a = (result[4] !== undefined) ? parseFloat(result[4]) : 1;

        color.setTo(r, g, b, a * 255);
    }

    return color;
}
Converts a CSS 'web' string into a Phaser Color object.

The web string can be in the format `'rgb(r,g,b)'` or `'rgba(r,g,b,a)'` where r/g/b are in the range [0..255] and a is in the range [0..1].

@function Phaser.Display.Color.RGBStringToColor
@since 3.0.0

@param {string} rgb - The CSS format color string, using the `rgb` or `rgba` format.

@return {Phaser.Display.Color} A Color object.