diff --git a/scripts/fluidd.sh b/scripts/fluidd.sh
index c5ca116..1be5cc5 100644
--- a/scripts/fluidd.sh
+++ b/scripts/fluidd.sh
@@ -366,7 +366,6 @@ function fluidd_port_check() {
 }
 
 function select_fluidd_port() {
-  local new_port
   if [[ ${PORT_80_BLOCKED} == "true" ]]; then
     echo
     top_border
@@ -377,18 +376,18 @@ function select_fluidd_port() {
     [[ ${OCTOPRINT_PORT} == "80" ]] && echo "|  ● OctoPrint                                          |"
     [[ ${MAINSAIL_PORT} == "80" ]] && echo "|  ● Mainsail                                           |"
     blank_line
-    echo -e "| Make sure you don't choose a port which was already   |"
-    echo -e "| assigned to one of the other webinterfaces and do ${red}NOT${white} |"
-    echo -e "| use ports in the range of 4750 or above!              |"
+    echo -e "| Make sure you don't choose a port which is already    |"
+    echo -e "| assigned to one of the other webinterfaces            |"
     blank_line
     echo -e "| Be aware: there is ${red}NO${white} sanity check for the following  |"
     echo -e "| input. So make sure to choose a valid port!           |"
     bottom_border
-    while true; do
-      #TODO implement regex input validation for numbers only
+
+    local new_port re="^[0-9]+$"
+    while [[ ! ${new_port} =~ ${re} ]]; do
       read -p "${cyan}Please enter a new Port:${white} " new_port
       if [[ ${new_port} != "${MAINSAIL_PORT}" ]] && [[ ${new_port} != "${OCTOPRINT_PORT}" ]]; then
-        echo "Setting port ${new_port} for Mainsail!"
+        echo "Setting port ${new_port} for Fluidd!"
         SET_LISTEN_PORT=${new_port}
         break
       else
diff --git a/scripts/mainsail.sh b/scripts/mainsail.sh
index e155b40..499969c 100644
--- a/scripts/mainsail.sh
+++ b/scripts/mainsail.sh
@@ -487,7 +487,6 @@ function mainsail_port_check() {
 }
 
 function select_mainsail_port() {
-  local new_port
   if [[ ${PORT_80_BLOCKED} == "true" ]]; then
     echo
     top_border
@@ -505,8 +504,9 @@ function select_mainsail_port() {
     echo -e "| Be aware: there is ${red}NO${white} sanity check for the following  |"
     echo -e "| input. So make sure to choose a valid port!           |"
     bottom_border
-    while true; do
-      #TODO implement regex input validation for numbers only
+
+    local new_port re="^[0-9]+$"
+    while [[ ! ${new_port} =~ ${re} ]]; do
       read -p "${cyan}Please enter a new Port:${white} " new_port
       if [[ ${new_port} != "${FLUIDD_PORT}" ]] && [[ ${new_port} != "${OCTOPRINT_PORT}" ]]; then
         echo "Setting port ${new_port} for Mainsail!"