目前我有这个与RGB字符串匹配的正则表达式。我需要对其进行增强，使其足够强大以匹配RGB或RGBA。rgbRegex=/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/;//matchesRGBhttp://jsfiddle.net/YxU2m/varrgbString="rgb(0,70,255)";varRGBAString="rgba(0,70,255,0.5)";varrgbRegex=/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/;//needhelponthisregex//Ifigureitneedstobe^rgba?,andth