更新URL参数

Question

我有以下字符串：

http://www.website.com?a=111&b=2222&d=3333

如何使用此字符串并使用b更新4444参数值？

Answer 1

var str = 'http://www.website.com?a=111&b=2222&d=3333';
str.replace(/([&\?]b=\d+/,"$1b=4444")

Answer 2

String.replace(/b=([^&]*)/, "b=4444")

Answer 3

var myString = "http://www.website.com?a=111&b=2222&d=3333".replace("b=2222","b=4444")