RegExp : How to replace the second occurrence using object?

Question

function convertHTML(str) {
  var objA={'&':'&amp;','<':'&lt;','>':'&gt;','\'':'&apos;','"':'\&quot;'}
  var matchStr = str.match(/([&|''|""|>|<])/g)
  var matchStr1=''
  for(var i=0; i<matchStr.length; ++i){

     matchStr1 = str.replace(matchStr[i], objA[matchStr[i]])

  }
  return matchStr1;
}

console.log(convertHTML("Hamburgers < Pizza < Tacos "));

Output i'm getting is Hamburgers &â€‹lt; Pizza < Tacos. I want Hamburgers &â€‹lt; Pizza &â€‹lt; Tacos. So is it possible to replace the second occurrence using this code with some changes ?.

[&|''|""|>|<] is not valid - you can't alternate inside a character class — Scott Weaver
– Scott Weaver, Commented Apr 6, 2017 at 13:38
Interesting, but not getting the result you are expecting and for what? May be there is some more easy way — Abhisek Malakar
– Abhisek Malakar, Commented Apr 6, 2017 at 13:41

kind user · Accepted Answer · 2017-04-06 13:37:34Z

1

I would suggest you to use following approach.

var objMap = {             // ===> object with specified keys
  '&': '&amp;',            // ===> that have to be replaced
  '<': '&lt;',             // ===> with their corresponding values
  '>': '&gt;',
  '\'': '&apos;',
  '"': '\&quot;'
}

function convertHTML(str) {
  var res = str.replace(/[&<>\\"]/g, match => objMap[match]);
  return res;
}

console.log(convertHTML("Hamburgers < Pizza < Tacos "));

answered Apr 6, 2017 at 13:37

kind user

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Comments

FarmaStron · Accepted Answer · 2017-04-06 13:54:57Z

0

The issue is in line:

matchStr1 = str.replace(matchStr[i], objA[matchStr[i]])

In each iteration "str" is always the same.

Your code fixed:

function convertHTML(str) {
  var objA={'&':'&amp;','<':'&lt;','>':'&gt;','\'':'&apos;','"':'\&quot;'}
  var matchStr = str.match(/([&|''|""|>|<])/g);
  for(var i=0; i<matchStr.length; ++i){
     str = str.replace(matchStr[i], objA[matchStr[i]])
  }
  return str;
}
console.log(convertHTML("Hamburgers < Pizza < Tacos "));

answered Apr 6, 2017 at 13:54

FarmaStron

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