javascript使用正则表达式替换或者捕获子字符串

let string = 'mutiFile[{"name":"新建文件夹 (2).zip","ext":".zip","size":1675876,"path":"/static/upload/2022December/ba145698fcc99fd414f0f4ec6ea418e5.zip"}]';

let newString = string.replace(/\[(.*?)\]/g, 'REPLACED');
console.log(newString);

let string = 'mutiFile[{"name":"新建文件夹 (2).zip","ext":".zip","size":1675876,"path":"/static/upload/2022December/ba145698fcc99fd414f0f4ec6ea418e5.zip"}]';

let regexp = /\[(.*?)\]/;
let match = string.match(regexp);

if (match) {
    console.log(match[1]);
}