diff --git a/bytes/regexp.go b/bytes/regexp.go
index 45a558a..a8b14c4 100644
--- a/bytes/regexp.go
+++ b/bytes/regexp.go
@@ -41,7 +41,7 @@ func (rr *RuneReader) Cursor() cursor.Cursor[byte] {
 }
 
 func Regexp(str string) gigaparsec.Parser[byte, []byte] {
-	if !strings.HasPrefix(str, "^") {
+	if !strings.HasPrefix(str, "^") && !strings.HasPrefix(str, `\A`) {
 		str = "^" + str
 	}
 	re := regexp.MustCompile(str)