I have the solution for getting the last part of URL

url = '/item/:id/edit'
url.split('/').pop();

Explain:

1. .split('/') means split the string which is separated by '/' to an array of substrings
2. .pop() means removes the last element of an array, and returns that element
3. .split('/').pop() means split the string which is separated by '/' to an array of substrings then removes the last element of an array and return that element

I hope this help

You can use ActivatedRoute interface, it contains the router state tree within the angular app’s memory.

The parent property represents the parent of the route in the router state tree, while the snapshot property is the current snapshot of the route and url is an observable of the URL segments and it matched by this route.

Step 1: Import ActivatedRoute

    import { ActivatedRoute } from '@angular/router';

Step 2: Inject ActivatedRoute in constructor.

    constructor(private route: ActivatedRoute) { }

Step 3: Call it in Oninit lifecycle hook

      constructor(private route: ActivatedRoute){}
        
           ngOnInit() {
              this.route.parent.snapshot.url[2].path;
           }

Since you want to get the URL part being in a parent component, you have to wait until the navigation occurs.

Get the last URL part from a parent component

router.events
  .pipe(
    filter(event => event instanceof NavigationEnd),
    map((event: NavigationEnd) => event.url)
  )
  .subscribe(url => {
    const lastUrlSegment = url.split('?')[0].split('/').pop()
  });

Where router is an injected Angular Router service. Here url.split('?')[0] returns the URL part without query parameters in case they exist, then split('/').pop() returns the last URL segment without the / character.

In case you'd like to

Get the last URL part from the child component

You could do that synchronously

const lastUrlSegment = router.url.split('?')[0].split('/').pop()

Where router is an injected Angular Router service. Pay attention, that under the child component I mean the one, rendered by the last URL segment we're looking for.