javascript - 如何用不同的结果替换文本中所有相同的字符/字符串？

Question

例如，假设我想将字符串中每个“s”的索引号附加到“s”。

var str = "This is a simple string to test regex.";
    var rm = str.match(/s/g);
    for (let i = 0;i < rm.length ;i++) {
        str = str.replace(rm[i],rm[i]+i);
    }
    console.log(str);

输出:This43210 是一个用于测试正则表达式的简单字符串。预期输出:This0 is1 a s2imple s3tring to tes4t regex。

Answer 1

我建议使用 replace():

let i = 0,
    str = "This is a simple string to test regex.",
  // result holds the resulting string after modification
  // by String.prototype.replace(); here we use the
  // anonymous callback function, with Arrow function
  // syntax, and return the match (the 's' character)
  // along with the index of that found character:
  result = str.replace(/s/g, (match) => {
    return match + i++;
  });
  console.log(result);

根据建议更正代码 — 在评论中 — 来自 Ezra .

引用资料:

• Arrow functions .
• “Regular expressions ,” 来自 MDN。
• String.prototype.replace() .