diff --git a/src/ui/createUser.py b/src/ui/createUser.py
index 6481aa3..a91c5a4 100644
--- a/src/ui/createUser.py
+++ b/src/ui/createUser.py
@@ -1,13 +1,17 @@
 from .sources.Ui_dialog_createUser import Ui_Dialog
 from PyQt6 import QtCore, QtGui, QtWidgets
+from PyQt6.QtGui import QRegularExpressionValidator
 from src.logic import Database
+from src.utils import Icon, Log
 from src.schemas import User
-
+import re
 
 class CreateUser(QtWidgets.QDialog, Ui_Dialog):
     def __init__(self, fieldname, data):
         super(CreateUser, self).__init__()
         self.setupUi(self)
+        self.setWindowTitle("Benutzer erstellen")
+        self.setWindowIcon(Icon("user").icon)
         # disable buttonbox save
         self.db = Database()
         self.buttonBox.button(
@@ -25,12 +29,22 @@ class CreateUser(QtWidgets.QDialog, Ui_Dialog):
             QtWidgets.QDialogButtonBox.StandardButton.Save
         ).clicked.connect(self.saveUser)
         self.userid = None
-
+        self.userno.setMaxLength(20)
+        self.user_mail.setValidator(
+            QRegularExpressionValidator(
+                QtCore.QRegularExpression(
+                    r"[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}"
+                )
+            )
+        )
+        self.userno.textChanged.connect(
+            lambda: self.validateInputUserno(self.userno.text(), "int")
+        )
     def checkFields(self):
         if (
-            self.username.text() != ""
-            and self.userno.text() != ""
-            and self.user_mail.text() != ""
+            self.username.hasAcceptableInput()
+            and self.userno.hasAcceptableInput()
+            and self.user_mail.hasAcceptableInput()
         ):
             self.buttonBox.button(
                 QtWidgets.QDialogButtonBox.StandardButton.Save
@@ -46,3 +60,19 @@ class CreateUser(QtWidgets.QDialog, Ui_Dialog):
         usermail = self.user_mail.text()
         self.db.insertUser(username, userno, usermail)
         self.userid = userno
+
+    def validateInputUserno(self, value, type):
+        lastchar = value[-1] if value else ""
+        # if lastchar is not of the type, remove it
+        if type == "int":
+            if not lastchar.isdigit():
+                self.userno.setText(value[:-1])
+
+    def validateInputMail(self, value):
+        pass
+
+
+def launch():
+    app = QtWidgets.QApplication([])
+    window = CreateUser("id", "123456")
+    window.exec()
\ No newline at end of file