替换Javascript中动态字符之间的动态值

Question

我在这样的字符之间有一个字符串：

new/set/25/
type/22/set/3/
aa/23/mine/set/9/yous
set/34
/dol/22/mmm/sss/set/23

它有一个像这样的值模式：

set/{n}

我尝试使用此函数替换 {n} 值：

var pathname = 'new/set/9/'   
pathName = pathName.replace(/(/\//gset/\//g)([0-9]+)/, '$1' + '5';
//expected result = new/set/5/

但它不起作用

Answer 1

您可以使用String.prototype.match 方法将所有捕获括号值替换为任何其他结果，如下所示

let pattern = /set\/(\d+)\/?/;

let chaines = [
  "new/set/25/",
  "type/22/set/3/",
  "aa/23/mine/set/9/yous",
  "set/34",
  "dol/22/mmm/sss/set/23"
];

chaines.map(c => {
  let matches = c.match(pattern);
  console.log(c.replace(matches[1], 5));
});

Answer 2

试试这个。

let pathname = `uid/22/new/set/203/key/90`;
pathname = pathname.replace(/(?<=set\/)\d+(?=\/)/g, 5);

console.log(pathname);

Answer 3

试试这个正则表达式模式(?<=set\/)\d+(?=\/)

Demo

console.log('uid/22/new/set/203/key/90'.replace(/(?<=set\/)\d+(?=\/)/g,'78'))