diff --git a/pgpainless-core/src/test/java/org/pgpainless/algorithm/RegexTest.java b/pgpainless-core/src/test/java/org/pgpainless/algorithm/RegexTest.java
index 0eafec9d..f1692569 100644
--- a/pgpainless-core/src/test/java/org/pgpainless/algorithm/RegexTest.java
+++ b/pgpainless-core/src/test/java/org/pgpainless/algorithm/RegexTest.java
@@ -5,6 +5,7 @@
 package org.pgpainless.algorithm;
 
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.stream.Stream;
@@ -117,4 +118,10 @@ public class RegexTest {
 
         RegexInterpreterFactory.setInstance(before);
     }
+
+    @ParameterizedTest
+    @MethodSource("provideRegexInterpreterFactories")
+    public void testInvalidRegex(RegexInterpreterFactory factory) {
+        assertThrows(IllegalArgumentException.class, () -> factory.instantiate("[ab"));
+    }
 }