diff --git a/src/lib/constants.ts b/src/lib/constants.ts
index 7f8acf88..a9e13c14 100644
--- a/src/lib/constants.ts
+++ b/src/lib/constants.ts
@@ -239,12 +239,12 @@ export const CHART_COLORS = [
 ];
 
 export const DOMAIN_REGEX =
-  /^(localhost(:[1-9]\d{0,4})?|((?=[a-z0-9-]{1,63}\.)(xn--)?[a-z0-9-]+(-[a-z0-9-]+)*\.)+(xn--)?[a-z0-9-]{2,63})$/;
+  /^(localhost(:[1-9]\d{0,4})?|((?=[a-z0-9-_]{1,63}\.)(xn--)?[a-z0-9-_]+(-[a-z0-9-_]+)*\.)+(xn--)?[a-z0-9-_]{2,63})$/;
 export const SHARE_ID_REGEX = /^[a-zA-Z0-9]{8,16}$/;
 export const UUID_REGEX =
   /^[0-9a-fA-F]{8}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{12}$/;
 export const HOSTNAME_REGEX =
-  /^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9-]*[A-Za-z0-9])$/;
+  /^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-_]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9-_]*[A-Za-z0-9])$/;
 export const IP_REGEX =
   /^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$|^(?:(?:[0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|(?:[0-9a-fA-F]{1,4}:){1,7}:|(?:[0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|(?:[0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|(?:[0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|(?:[0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|(?:[0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:(?:(:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]+|::(ffff(:0{1,4})?:)?((25[0-5]|(2[0-4]|1?[0-9])?[0-9])\.){3}(25[0-5]|(2[0-4]|1?[0-9])?[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1?[0-9])?[0-9])\.){3}(25[0-5]|(2[0-4]|1?[0-9])?[0-9]))$/;
 export const DATETIME_REGEX =