How to handle TextField validation in password in Flutter

Question

I created a login page and I need to add these things to my password. How do I do it with validation alert message?

• Minimum 1 Upper case

Answer 1

here is the complete answer

Write a Dart program to check whether a string is a valid password. a. A password must have at least ten characters. b. A password consists of only letters and digits. c. A password must contain at least two digits.

import 'dart:io';

main() {
  var password;
  stdout.write("Enter You'r Password: ");
  password=stdin.readLineSync();

   if(password.length>=10 && !password.contains(RegExp(r'\W')) && RegExp(r'\d+\w*\d+').hasMatch(password))
   {
     print(" \n\t$password is Valid Password");
   }
   else
   {
     print("\n\t$password is Invalid Password");

   }