Regex to find id in url

I have the following URL:

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

Although it can also be:

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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?

---

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.
   }
   

---

/\/product\/(\d+)/ and obtain $1.

---

Just, as an alternative, to do this without Regex (though i admit regex is awfully nice here)

var url = "http://test.example.com//mypage/1/test/test//test";
var newurl = url.replace("http://","").split("/");
for(i=0;i<newurl.length;i++) {
    if(newurl[i] == "") {
     newurl.splice(i,1);   //this for loop takes care of situatiosn where there may be a // or /// instead of a /
    }
}
alert(newurl[2]); //returns 1

---

I would like to suggest another option.

.match(/\/(\d+)+[\/]?/g)

This would return all matches of id's present.

Example:

var url = 'http://localhost:4000/#/trees/8/detail/3';

    // with slashes
    var ids = url.match(/\/(\d+)+[\/]?/g);
    console.log(ids);

    //without slashes
    ids = url.match(/\/(\d+)+[\/]?/g).map(id => id.replace(/\//g, ''));
    console.log(ids);

This way, your URL doesn't even matter, it justs retrieves all parts that are number only.

To just get the first result you could remove the g modifier:

 .match(/\/(\d+)+[\/]?/)

var url = 'http://localhost:4000/#/trees/8';


var id = url.match(/\/(\d+)+[\/]?/);
//With and without slashes
console.log(id);

The id without slashes would be in the second element because this is the first group found in the full match.

Hope this helps people. Cheers!