Replace nth occurrence of string

Question

For example:

\'abcjkjokabckjk\'.replace(\'/(abc)/g\',...)

If I want to replace a specify position \'abc\', what I can do?

Like this

Answer 1

Use Avinash's approach with RegExp constructor

const replace_nth = function (s, f, r, n) {
    // From the given string s, replace f with r of nth occurrence
    return s.replace(RegExp("^(?:.*?" + f + "){" + n + "}"), x => x.replace(RegExp(f + "$"), r));
};

Here's an example outout.

$node
Welcome to Node.js v13.1.0.
Type ".help" for more information.
>
>  const replace_nth = function (s, f, r, n) {
...    // From the given string s, replace f with r of nth occurrence
...    return s.replace(RegExp("^(?:.*?" + f + "){" + n + "}"), x => x.replace(RegExp(f + "$"), r));
...};

> replace_nth('hello world', 'l', 'L', 1)
'heLlo world'