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 RegExp constructor to pass variables inside regex.

var s = 'abcjkjokabckjk'
search = 'abc'
var n = 2
alert(s.replace(RegExp("^(?:.*?abc){" + n + "}"), function(x){return x.replace(RegExp(search + "$"), "HHHH")}))