regex: add unit tests for non-matching anchor bytes

This is in addition to the integration level test added in
581a35e568c3acd32461d276a4cfe746524e17cd.

1 files changed, 8 insertions, 0 deletions

diff --git a/crates/regex/src/non_matching.rs b/crates/regex/src/non_matching.rs
index e2e0755b..7f68e84a 100644
--- a/crates/regex/src/non_matching.rs
+++ b/crates/regex/src/non_matching.rs
@@ -128,4 +128,12 @@ mod tests {
         assert_eq!(sparse(&extract(r"\xFF")), sparse_except(&[0xC3, 0xBF]));
         assert_eq!(sparse(&extract(r"(?-u)\xFF")), sparse_except(&[0xFF]));
     }
+
+    #[test]
+    fn anchor() {
+        assert_eq!(sparse(&extract(r"^")), sparse_except(&[b'\n']));
+        assert_eq!(sparse(&extract(r"$")), sparse_except(&[b'\n']));
+        assert_eq!(sparse(&extract(r"\A")), sparse_except(&[b'\n']));
+        assert_eq!(sparse(&extract(r"\z")), sparse_except(&[b'\n']));
+    }
 }