The best app in the world Registration Age Full Name Email Phone Number Password Date of Birth Requirements Age - Slider with cutoffs at 30 and 60 - Discount depends on selected value: Up to 30 - 5% up to 60 - 10% after 60 - 22% Full Name - Cyrillic, - space separating parts of the full name Email - @ mask Phone Number - +7 Password - Latin letters - No more than 8 characters - Contains at least 3 uppercase letters - Ninth character - special symbol Date of Birth - Format dd.mm.yyyy

To implement registration with the specified requirements, validation can be used on both the frontend and backend.

Age:

• Use a slider with marks at 30 and 60.
• Calculate the discount based on the selected value:
  • Up to 30 years — 5%
  • Up to 60 years — 10%
  • Over 60 — 22%

Full Name:

• Check that the input text is in Cyrillic.
• Name parts are separated by a space.
• Regular expression for validation: /^[А-ЯЁ][а-яё]+(\s[А-ЯЁ][а-яё]+){1,2}$/

Email:

• Check for the presence of @ symbol and basic email structure.
• Example regex: /^[\w.-]+@[\w.-]+\.[a-zA-Z]{2,}$/

Phone Number:

• Check that the number starts with +7.
• Example: /^\+7\d{10}$/

Password:

• Latin characters, no more than 8 characters.
• At least 3 uppercase letters.
• The ninth character is a special symbol (if length >= 9).
• Validation example:

import re
password = "AbCDefGh!"
if len(password) <= 8:
    print("Password is too short")
else:
    uppercase_count = len(re.findall(r'[A-Z]', password))
    if uppercase_count < 3:
        print("Less than 3 uppercase letters")
    if len(password) >= 9 and not re.match(r'.{8}[!@#$%^&*]', password):
        print("Ninth character is not a special symbol")

Date of Birth:

• Format dd.mm.yyyy.
• Validation with regex: /^(0[1-9]|[12][0-9]|3[01])\.(0[1-9]|1[0-2])\.\d{4}$/

This approach ensures correct data input and allows dynamic calculation of age-based discounts.