Fix bug where RTDB trigger for instances w/ "ref" in the db name were incorrectly parsed.

Fixes #1055

Author: rhodgkins

CHANGELOG.md

@@ -1 +1,2 @@
 - Add support for more regions and memory for v2 functions (#1037).
+- Fixes bug where some RTDB instance names were incorrectly parsed (#1056).

spec/v1/providers/database.spec.ts

@@ -529,6 +529,22 @@ describe('Database Functions', () => {
       expect(path).to.equal('/bar');
     });
 
+    it('should return the correct instance and path strings if root path is /refs', () => {
+      const [instance, path] = database.extractInstanceAndPath(
+        'projects/_/instances/foo/refs/refs'
+      );
+      expect(instance).to.equal('https://foo.firebaseio.com');
+      expect(path).to.equal('/refs');
+    });
+
+    it('should return the correct instance and path strings if a child path contain /refs', () => {
+      const [instance, path] = database.extractInstanceAndPath(
+        'projects/_/instances/foo/refs/root/refs'
+      );
+      expect(instance).to.equal('https://foo.firebaseio.com');
+      expect(path).to.equal('/root/refs');
+    });
+
     it('should return the correct multi-region instance and path strings if domain is present', () => {
       const [instance, path] = database.extractInstanceAndPath(
         'projects/_/instances/foo/refs/bar',

src/providers/database.ts

@@ -307,6 +307,8 @@ export class RefBuilder {
   };
 }
 
+const resourceRegex = /^projects\/([^/]+)\/instances\/([a-zA-Z0-9-]+)\/refs(\/.+)?/;
+
 /**
  * Utility function to extract database reference from resource string
  *
@@ -320,7 +322,6 @@ export function extractInstanceAndPath(
   resource: string,
   domain = 'firebaseio.com'
 ) {
-  const resourceRegex = `projects/([^/]+)/instances/([a-zA-Z0-9\-^/]+)/refs(/.+)?`;
   const match = resource.match(new RegExp(resourceRegex));
   if (!match) {
     throw new Error(