javascript - How to make the last part of this REGEX optional?

Question

I am looping through all the links on a page and matching their href values against the following pattern:

([^/]+)/([0-9]+)/([^/]+)

Problem is there are 2 types of link formats on the page:

1. /video/123/slug
2. /video/123

Number 1. gets captured fine with the above regex but the 2nd fails. I want to make the third piece of the regex (the slug) optional so that both link formats return true when matched agains the regex. How to do this?

Answer 1

Put the last bit in brackets of a non-capturing group and add a ?:

([^/]+)/([0-9]+)(?:/([^/]+))?