JavaScript - Regular Expression with replace not working

Question

I tried a very simple regular expression.

var name = "jon snow"

name = name.replace("/jon/i", "hans");

$("#output").html(name);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p id="output"></p>

I simply try to replace "jon" with "hans" by using regular expressions. But It does not work.

I informed my selve here.

EDIT: My question is obviously completly different from the "duplicate".

When you wrapped your regex in quotes, JS only sees it as a string. Instead of quotes, regular expressions are wrapped (usually) in slashes. — Lix, Jun 01 '17 at 13:29
Possible duplicate of [How to replace all occurrences of a string in JavaScript?](https://stackoverflow.com/questions/1144783/how-to-replace-all-occurrences-of-a-string-in-javascript) — toesslab, Jun 01 '17 at 14:09

score 4 · Accepted Answer · answered Jun 01 '17 at 13:30

Just remove the "" in replace.you are matching the string not the regex pattern

var name = "jon snow"

name = name.replace(/jon/i, "hans");

$("#output").html(name);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p id="output"></p>

score 2 · Answer 2 · answered Jun 01 '17 at 13:28

2

You need to remove the quotations; there is a regex literal in JS:

let regex = /jon/i; // this is a regex
let str = "foo"; // this is a string

answered Jun 01 '17 at 13:28

Luan Nico

score 0 · Answer 3 · answered Jun 01 '17 at 13:29

0

When using replace with a regular expression, don't put quotes around the first parameter--just the slashes with the regex options.

answered Jun 01 '17 at 13:29

score 0 · Answer 4 · answered Jun 01 '17 at 13:31

0

You need to use the regex expression without ""

var name = "jon snow"

name = name.replace(/jon/i, "hans");

$("#output").html(name);

answered Jun 01 '17 at 13:31

Daniel Taub

4 Answers4