diff --git a/hy2.sh b/hy2.sh
index 5a4e626..8e8718e 100644
--- a/hy2.sh
+++ b/hy2.sh
@@ -108,7 +108,7 @@ validate_domain() {
   [[ -n "$domain" ]] || return 1
   [[ "$domain" != *$'\n'* ]] || return 1
   [[ "$domain" != *$'\r'* ]] || return 1
-  [[ "$domain" =~ ^([a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z]{2,63}$ ]]
+  [[ "$domain" =~ ^([a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z]{2,63}$ ]]
 }
 
 get_server_ip() {