write add user

UI/datacheck.py

@@ -9,4 +9,27 @@ class LoginForm(FlaskForm):
     password = PasswordField('Password', validators=[
         InputRequired(message='Password is required.'),
         Length(min=1, max=30, message='Password must be between 1 and 30 characters long.')
-    ])
+    ])
+
+class AddUserForm(FlaskForm):
+    username = StringField('Username', validators=[
+        InputRequired(message='Username is required.'),
+        Regexp(r'^[a-zA-Z][a-zA-Z0-9_]{0,19}$', message='Username must start with a letter and can only contain letters, numbers, and underscores (max 20 characters).')
+    ])
+    password = PasswordField('Password', validators=[
+        InputRequired(message='Password is required.'),
+        Length(min=1, max=30, message='Password must be between 1 and 30 characters long.')
+    ])
+    name = StringField('Name', validators=[
+        InputRequired(message='Name is required.'),
+        Regexp(r'^[\u4e00-\u9fa5]{2,5}$', message='Name must be 2-5 Chinese characters.')
+    ])
+    mailAddr = StringField('Email', validators=[
+        InputRequired(message='Email is required.'),
+        Length(max=30, message='Email must be less than 30 characters long.'),
+        Regexp(r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$', message='Invalid email format.')
+    ])
+    privilege = StringField('Privilege', validators=[
+        InputRequired(message='Privilege is required.'),
+        Regexp(r'^[0-9]$|^10$', message='Privilege must be an integer between 0 and 10.')
+    ])