diff --git a/tests/PHPStan/Analyser/nsrt/bug-12242.php b/tests/PHPStan/Analyser/nsrt/bug-12242.php
index c8a9416249..cb6d424567 100644
--- a/tests/PHPStan/Analyser/nsrt/bug-12242.php
+++ b/tests/PHPStan/Analyser/nsrt/bug-12242.php
@@ -15,3 +15,18 @@ function foo(string $str): void
 		assertType('array{string, string}', $match);
 	}
 }
+
+function bar(string $str): void
+{
+	$regexp = '/^
+            (\w+)        # column type [1]
+            [\(]         # (
+                ?([\d,]*)  # size or size, precision [2]
+            [\)]         # )
+            ?\s*         # whitespace
+            (\w*)        # extra description (UNSIGNED, CHARACTER SET, ...) [3]
+        $/x';
+	if (preg_match($regexp, $str, $matches)) {
+		assertType('array{string, non-empty-string, string, string}', $matches);
+	}
+}