js正则匹配markdown里的图片标签的实现

const str = "asddsad![标题](url)asdasddasd"; //一段markdown文本，包含一个图片"![标题](url)"
let result = str.match(/!\[(.?)\]\((.?)\)/); //直接查找
console.log(result); 

const str = "asghfj![标题1](url1)gfhasfr![标题2](url2)sadas";
const pattern = /!\[(.?)\]\((.?)\)/mg;
let matcher;

while ((matcher = pattern.exec(str)) !== null) {
  console.log(matcher);
}

//最简单的替换
"123".replace('1','a'); //把1替换为a