Recommand · October 14, 2021 0

Why isn't this simple alphanumeric regex matching with JS but it is matching on regex101?

This question already has an answer here:

Why this javascript regex doesn't work?

(1 answer)

Closed 12 mins ago.

I’m trying to test the string UNCLTEST614NESZZ.

Using the regex /^[a-z0-9]+$/i.

Below is the code being used.

let regex = new RegExp("/^[a-z0-9]+$/i");
let match = regex.test(serial);

Yet match ends up being false, despite the same regex and test string in regex101 producing a positive result

https://regex101.com/r/MrpcB5/1

Based on the documentation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

You can either use

let regex = new RegExp("^[a-z0-9]+$", "i");

or

let regex = /^[a-z0-9]+$/i;