Javascript | case-insensitive string replace

Question

I have this function :

function boldString(str, find){
   return str.replace(find, '<b>'+find+'</b>');
}

It works, except that it is case sensitive.

I could to-lower-case the str and find text before running the replace, But I want the function to return the original capitalization in the str field

So if I pass in 'Apple' for the str, and 'ap' for the find, I want the function to return 'Apple'.

If you return the `Apple` then the function is not replacing anything, you are returning the string, are you looking for `includes` method. — Abhinav Galodha, Feb 09 '17 at 01:29
@Agalo When I call the function, I set a string equal to the return variable. — Wyatt, Feb 09 '17 at 01:33

score 27 · Accepted Answer · answered Feb 09 '17 at 01:32

27

With a case-insensitive regular expression:

function boldString(str, find) {
  var reg = new RegExp('('+find+')', 'gi');
  return str.replace(reg, '<b>$1</b>');
}
console.log(boldString('Apple', 'ap'))

answered Feb 09 '17 at 01:32

tklg

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Javascript | case-insensitive string replace

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