diff --git a/plugins/ultraplan-local/examples/02-real-cli/tests/tally.test.mjs b/plugins/ultraplan-local/examples/02-real-cli/tests/tally.test.mjs
index 0b132bb..e01d798 100644
--- a/plugins/ultraplan-local/examples/02-real-cli/tests/tally.test.mjs
+++ b/plugins/ultraplan-local/examples/02-real-cli/tests/tally.test.mjs
@@ -91,3 +91,37 @@ test('--help: stdout contains "Usage:", exit 0', () => {
   assert.match(r.stdout, /Usage:/);
   assert.match(r.stdout, /--ignore-case/);
 });
+
+// --- Tests for --regex / -r mode (added in plan step 4, Spor B B3) ---
+
+test("--regex 'fo+' counts more matches than literal 'foo' (long form, exit 0)", () => {
+  const literal = run('foo', SAMPLE);
+  const regex = run('--regex', 'fo+', SAMPLE);
+  assert.equal(literal.status, 0);
+  assert.equal(regex.status, 0);
+  assert.ok(Number(regex.stdout) >= Number(literal.stdout),
+    `regex count (${regex.stdout.trim()}) should be >= literal count (${literal.stdout.trim()})`);
+});
+
+test("-r short form equals --regex long form (same stdout)", () => {
+  const short = run('-r', 'fo+', SAMPLE);
+  const long = run('--regex', 'fo+', SAMPLE);
+  assert.equal(short.status, 0);
+  assert.equal(long.status, 0);
+  assert.equal(short.stdout, long.stdout);
+});
+
+test("--regex '[' exits 2 with stderr 'tally: invalid regex'", () => {
+  const r = run('--regex', '[', SAMPLE);
+  assert.equal(r.status, 2);
+  assert.equal(r.stdout, '');
+  assert.match(r.stderr, /^tally: invalid regex/);
+});
+
+test("--json --regex 'fo+' includes flags.regex === true in output", () => {
+  const r = run('--json', '--regex', 'fo+', SAMPLE);
+  assert.equal(r.status, 0);
+  const parsed = JSON.parse(r.stdout);
+  assert.equal(parsed.flags.regex, true);
+  assert.ok(typeof parsed.count === 'number' && parsed.count > 0);
+});