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
diff --git a/phone/phone.go b/phone/phone.go
index 3f18ad5..b6ea181 100644
--- a/phone/phone.go
+++ b/phone/phone.go
@@ -9,7 +9,9 @@ import (
 // Define the regex patterns as constants
 const (
 	// TODO: This should rather use a phone package to determine whether valid phone number for any region.
-	phoneRegex = `^(?:\+254|254|0)?((?:7[0-9]{8})|(?:1[01][0-9]{7}))$`
+	// Kenyan phone numbers: must be exactly 10 digits (07XXXXXXXX or 01XXXXXXXX) when starting with 0
+	// Or start with 254 / +254 and still follow the same pattern
+	phoneRegex = `^(?:\+254|254|0)(7\d{8}|1[01]\d{7})$`
 )
 
 // IsValidPhoneNumber checks if the given number is a valid phone number