Unclosed regex pattern at position: 2327651

[zaitebaki]

I get the error

"Uncaught: Unclosed regex pattern at position: 2327651"

when using the JavaScript code:

let jj = jid.match(/([^/]+)(?:\/(.+))?/);

If I replace the code like this:

const regex = new RegExp("([^/]+)(?:\/(.+))?");
let jj = jid.match(regex);

the error disappears, and everything works as expected.