Question

I have the following URL:

http://example.com/product/1/something/another-thing

Although it can also be:

http://test.example.com/product/1/something/another-thing

or

http://completelydifferentdomain.tdl/product/1/something/another-thing

And I want to get the number 1 (id) from the URL using Javascript.

The only thing that would always be the same is /product. But I have some other pages where there is also /product in the url just not at the start of the path.

What would the regex look like?

Answer 1

1. Use window.location.pathname to
   retrieve the current path (excluding
   TLD).

2. Use the JavaScript string
   match method.

3. Use the regex /^\/product\/(\d+)/ to find a path which starts with /product/, then one or more digits (add i right at the end to support case insensitivity).

4. Come up with something like this:

   var res = window.location.pathname.match(/^\/product\/(\d+)/);
   if (res.length == 2) {
       // use res[1] to get the id.
   }