下面pattern中的问号和括号有特殊作用吗？不太懂

Question

var text = "mom and dad and baby";var pattern = /mom( and dad( and baby)?)?/gi;var matches = pattern.exec(text);alert(matches.index); // 0alert(matches.input); // "mom and dad and baby"alert(matches[0]); // "mom and dad and baby"alert(matches[1]); // " and dad and baby"aler t(matches[2]); // " and baby"

Answer 1

这是正则表达式吧，问号在量词元字符后面表示取消贪婪模式，即在满足条件下，尽可能少地匹配。