diff --git a/lexer/src/tests.rs b/lexer/src/tests.rs
index b6ed4f3..c67c2cc 100644
--- a/lexer/src/tests.rs
+++ b/lexer/src/tests.rs
@@ -216,3 +216,22 @@ fn lexer_test_general_tokens() {
         ]
     );
 }
+
+#[test]
+fn lexer_test_regex_ambiguity() {
+    let arena = Bump::new();
+    assert_eq!(
+        &lex(b"1/=1 a/=1", &arena, false, false),
+        &[
+            Token::Number(1.),
+            Token::SlashAssign,
+            Token::Number(1.),
+            Token::Identifier(Identifier {
+                namespace: None,
+                literal: "a"
+            }),
+            Token::SlashAssign,
+            Token::Number(1.)
+        ]
+    );
+}