关于正则捕获问题

Question

var str='hello <img src="haha.png" alt="哈哈"/>world';正确匹配输出’hello[哈哈]world’

Answer 1

var str='hello <img src="haha.png" alt="哈哈"/>world';

let exp = /^(\S+)\s?[<].*[alt="](.*?)["]\s*[\/>]\s*(\S+)$/;

let ret = str.match(exp);

str = ret[1]+'['+ret[2]+']'+ret[3];

console.log(str);