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.

Jsfiddle

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
– Lix, Commented Jun 1, 2017 at 13:29
Possible duplicate of How to replace all occurrences of a string in JavaScript? — Daniel Gasser
– Daniel Gasser, Commented Jun 1, 2017 at 14:09

prasanth · Accepted Answer · 2017-06-01 13:30:03Z

4

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>

answered Jun 1, 2017 at 13:30

prasanth

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Comments

Luan Nico · Accepted Answer · 2017-06-01 13:28:57Z

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 1, 2017 at 13:28

Luan Nico

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Comments

user8086575 · Accepted Answer · 2017-06-01 13:29:45Z

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 1, 2017 at 13:29

user8086575

Comments

Daniel Taub · Accepted Answer · 2017-06-01 13:31:31Z

0

You need to use the regex expression without ""

var name = "jon snow"

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

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

answered Jun 1, 2017 at 13:31

Daniel Taub

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