用标签替换特定单词

Question

下面有一个字符串，在花括号内有一些单词，我想提取单词并将其作为数组

输入：

 let string = 'Hello John \n, the time is ${time} and its ${day} of ${month} ${year}'

输出：

let keys = ["time", "day", "month", "year"]

在正则表达式中实现它的正确方法是什么。

如何用输入标签替换字符串，如下所示。

  let string = 'Hello John \n, the time is <input name='time' /> and its <input name='day' /> of <input name='month' /> <input name='year' />'

Answer 1

您可以捕获所有匹配的组

const string = 'Hello John \n, the time is ${time} and its ${day} of ${month} ${year}'
const regex = /\$\{(\w+)\}/g
const res = [];
let matches

while (matches = regex.exec(string)) {
  res.push(matches[1]);
}

console.log(res)

关于替换，使用捕获的组（基于1的索引）的顺序，使用美元符号（.replace）对修改后的Catupered组执行字符串$

const string = 'Hello John \n, the time is ${time} and its ${day} of ${month} ${year}'
const res = string.replace(/\$\{(\w+)\}/g, '<input name="$1"/>')

console.log(res)