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I like to replace a string after a specific index.

ex: 

var str = "abcedfabcdef"
    str.replace ("a","z",2)
    console.log(str) 
    abcedfzbcdef

Is there any way to do this in javascript or in nodeJS?

I like to replace a string after a specific index.

ex: 

var str = "abcedfabcdef"
    str.replace ("a","z",2)
    console.log(str) 
    abcedfzbcdef

Is there any way to do this in javascript or in nodeJS?

  • javascript
  • node.js
  • replace
  • frontend
  • nodes
Share Improve this question edited Sep 1, 2017 at 23:49 Shankar asked Sep 1, 2017 at 23:45 ShankarShankar 1432 silver badges10 bronze badges
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2 Answers 2

Reset to default 7

There is no direct way using the builtin replace function but you can always create a new function for that:

String.prototype.betterReplace = function(search, replace, from) {
  if (this.length > from) {
    return this.slice(0, from) + this.slice(from).replace(search, replace);
  }
  return this;
}

var str = "abcedfabcdef"
console.log(str.betterReplace("a","z","2"))

Regular expression alternative, but replaces all occurrences after specific index:

console.log( 'abcabcabc'.replace(/a/g, (s, i) => i > 2 ? 'z' : s) )

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