MOBILE-3320 course: Fix regex patch matcher

src/app/app-routing.module.test.ts

@@ -17,7 +17,7 @@ import { UrlSegment, UrlSegmentGroup } from '@angular/router';
 
 import { mock } from '@/testing/utils';
 
-import { buildRegExpUrlMatcher } from '../app-routing.module';
+import { buildRegExpUrlMatcher } from './app-routing.module';
 
 describe('Routing utils', () => {
 
@@ -35,6 +35,7 @@ describe('Routing utils', () => {
                 );
 
         testMatcher('baz/foo/bar', null);
+        testMatcher('foobar', null);
         testMatcher('foo', ['foo']);
         testMatcher('foo/baz', ['foo']);
         testMatcher('foo/bar/bar/baz', ['foo', 'bar', 'bar']);

src/app/app-routing.module.ts

@@ -113,14 +113,18 @@ export function buildRegExpUrlMatcher(regexp: RegExp): UrlMatcher {
         }
 
         // Consume segments that match.
-        const [consumed] = segments.slice(1).reduce(([consumed, path], segment) => path === match
-            ? [consumed, path]
-            :[
-                consumed.concat(segment),
+        const [consumedSegments, consumedPath] = segments.slice(1).reduce(([segments, path], segment) => path === match
+            ? [segments, path]
+            : [
+                segments.concat(segment),
                 `${path}/${segment.path}`,
             ], [[segments[0]] as UrlSegment[], segments[0].path]);
 
-        return { consumed };
+        if (consumedPath !== match) {
+            return null;
+        }
+
+        return { consumed: consumedSegments };
     };
 }