diff --git a/ui/src/Components/SilenceModal/SilenceMatch.test.js b/ui/src/Components/SilenceModal/SilenceMatch.test.js
new file mode 100644
index 000000000..5a8ebb9c9
--- /dev/null
+++ b/ui/src/Components/SilenceModal/SilenceMatch.test.js
@@ -0,0 +1,37 @@
+import React from "react";
+
+import { shallow } from "enzyme";
+
+import { NewEmptyMatcher, MatcherValueToObject } from "Stores/SilenceFormStore";
+import { SilenceMatch } from "./SilenceMatch";
+
+let matcher;
+
+beforeEach(() => {
+  matcher = NewEmptyMatcher();
+});
+
+const ShallowLabelValueInput = () => {
+  return shallow(<SilenceMatch matcher={matcher} />);
+};
+
+describe("<SilenceMatch />", () => {
+  it("allows changing matcher.isRegex value when matcher.values contains 1 element", () => {
+    matcher.values = [MatcherValueToObject("foo")];
+    const tree = ShallowLabelValueInput();
+    expect(matcher.isRegex).toBe(false);
+    const regex = tree.find("input[type='checkbox']");
+    regex.simulate("change", { target: { checked: true } });
+    expect(matcher.isRegex).toBe(true);
+  });
+
+  it("disallows changing matcher.isRegex value when matcher.values contains 2 elements", () => {
+    matcher.isRegex = true;
+    matcher.values = [MatcherValueToObject("foo"), MatcherValueToObject("bar")];
+    const tree = ShallowLabelValueInput();
+    expect(matcher.isRegex).toBe(true);
+    const regex = tree.find("input[type='checkbox']");
+    regex.simulate("change", { target: { checked: false } });
+    expect(matcher.isRegex).toBe(true);
+  });
+});