feat: add Python and Java regex engines

src/components/QuickReference.test.tsx

@@ -53,4 +53,67 @@ describe("QuickReference", () => {
       screen.getByRole("link", { name: "PCRE2 pattern documentation" }),
     ).toHaveAttribute("href", expect.stringContaining("pcre.org"));
   });
+
+  it("shows an original Python 3.14 re reference without borrowing ECMAScript syntax", async () => {
+    const user = userEvent.setup();
+    render(<QuickReference flavour="python" onUsePattern={vi.fn()} />);
+
+    expect(
+      screen.getByText("Original Python 3.14 re reference"),
+    ).toBeInTheDocument();
+    expect(screen.getByText("8 of 8 constructs")).toBeInTheDocument();
+
+    await user.type(screen.getByLabelText("Filter constructs"), "absolute end");
+
+    expect(screen.getByText("Absolute end anchor")).toBeInTheDocument();
+    expect(screen.getByText("\\z")).toBeInTheDocument();
+    expect(screen.getByText("python")).toBeInTheDocument();
+    expect(
+      screen.getByRole("link", { name: "Python 3.14 re documentation" }),
+    ).toHaveAttribute("href", "https://docs.python.org/3.14/library/re.html");
+  });
+
+  it("shows an original Java Pattern reference from the official Java API", async () => {
+    const user = userEvent.setup();
+    render(<QuickReference flavour="java" onUsePattern={vi.fn()} />);
+
+    expect(
+      screen.getByText("Original Java Pattern reference"),
+    ).toBeInTheDocument();
+    expect(screen.getByText("9 of 9 constructs")).toBeInTheDocument();
+    expect(
+      screen.getByText(
+        /bundled TeaVM 0\.15\.0 adapter is a tested compatibility subset/u,
+      ),
+    ).toBeInTheDocument();
+
+    await user.type(screen.getByLabelText("Filter constructs"), "intersection");
+
+    expect(
+      screen.getByText("Character-class intersection"),
+    ).toBeInTheDocument();
+    expect(screen.getByText("[class&&class]")).toBeInTheDocument();
+    expect(screen.getByText("java")).toBeInTheDocument();
+    expect(
+      screen.getByRole("link", {
+        name: "Java SE 25 Pattern documentation",
+      }),
+    ).toHaveAttribute(
+      "href",
+      "https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/regex/Pattern.html",
+    );
+  });
+
+  it("does not relabel an unreviewed flavour as ECMAScript", () => {
+    render(<QuickReference flavour="go" onUsePattern={vi.fn()} />);
+
+    expect(
+      screen.getByText("Original Go regexp reference"),
+    ).toBeInTheDocument();
+    expect(screen.getByText("0 of 0 constructs")).toBeInTheDocument();
+    expect(screen.getByRole("status")).toHaveTextContent(
+      "No reviewed quick reference is available for Go regexp.",
+    );
+    expect(screen.queryByText("Any character")).not.toBeInTheDocument();
+  });
 });