updated input check

dokuwikiinstall

@@ -39,12 +39,18 @@ usage () {
 }
 
 #
-# Function input check
+# Parse and validate input
 #
-inputcheck () {
-    if [[ -z "$1" ]]; then usage ; printf "ERROR: DOMAIN CANNOT BE EMPTY!\n\n" ; exit 1; fi
-    if [[ "$1" =~ [[:space:]/] ]]; then printf "ERROR: DOMAIN INVALID (no spaces or slashes allowed)\n\n"; exit 1; fi
-}
+if [[ $# -ne 1 ]]; then usage ; printf "ERROR: Exactly one argument (the domain) is required.\n\n" ; exit 1 ; fi
+
+hostname="$1" ; hostname=$(echo "$hostname" | tr '[:upper:]' '[:lower:]')
+
+if [[ "$hostname" =~ [[:space:]/_] ]]; then printf "ERROR: Domain cannot contain spaces, slashes, or underscores.\n\n" ; exit 1 ; fi
+
+if [[ ! "$hostname" =~ ^([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,}$ ]]; then
+    printf "ERROR: Invalid domain format.\n"
+    printf "Example of valid input: wiki.example.com\n\n" ; exit 1
+fi
 
 #
 # Let's go