fix: Escape regex for embeds (#3907)

Fixes #3899

shared/editor/embeds/Gliffy.test.ts

@@ -0,0 +1,14 @@
+import Gliffy from "./Gliffy";
+
+describe("Gliffy", () => {
+  const match = Gliffy.ENABLED[0];
+
+  test("to not be enabled elsewhere", () => {
+    expect("https://gotgliffy.com/go/share/c9d837d74182317".match(match)).toBe(
+      null
+    );
+    expect("https://go.gliffyycom/go/share/c9d837d74182317".match(match)).toBe(
+      null
+    );
+  });
+});