diff --git a/identity/alias.go b/identity/alias.go
index 0971c48..81a0a31 100644
--- a/identity/alias.go
+++ b/identity/alias.go
@@ -5,7 +5,7 @@ import (
 )
 
 const (
-	aliasRegex = `^[a-zA-Z0-9]+(\.[a-zA-Z0.9]+)*$`
+	aliasRegex = `^(?i)[a-z][a-z0-9]*(\.[a-z0-9]+)*$`
 )
 
 // IsValidAlias checks if the alias is a valid alias format