Dart : How to check if password contains all required characters · GitHub

bool isPasswordCompliant(String password, [int minLength = 6]) {
  if (password == null || password.isEmpty) {
    return false;
  }

  bool hasUppercase = password.contains(new RegExp(r'[A-Z]'));
  bool hasDigits = password.contains(new RegExp(r'[0-9]'));
  bool hasLowercase = password.contains(new RegExp(r'[a-z]'));
  bool hasSpecialCharacters = password.contains(new RegExp(r'[!@#$%^&*(),.?":{}|<>]'));
  bool hasMinLength = password.length > minLength;

  return hasDigits & hasUppercase & hasLowercase & hasSpecialCharacters & hasMinLength;
}

thanks thiago, excelent abreviation

bool isPasswordCompliant(String password, [int minLength = 6]) {
  if (password == null || password.isEmpty) {
    return false;
  }

  bool hasUppercase = password.contains(new RegExp(r'[A-Z]'));
  bool hasDigits = password.contains(new RegExp(r'[0-9]'));
  bool hasLowercase = password.contains(new RegExp(r'[a-z]'));
  bool hasSpecialCharacters = password.contains(new RegExp(r'[!@#$%^&*(),.?":{}|<>]'));
  bool hasMinLength = password.length > minLength;

  return hasDigits & hasUppercase & hasLowercase & hasSpecialCharacters & hasMinLength;
}

It should be bool hasMinLength = password.length >= minLength;

bool isPasswordCompliant(String password, [int minLength = 6]) {
  if (password == null || password.isEmpty) {
    return false;
  }

  bool hasUppercase = password.contains(new RegExp(r'[A-Z]'));
  bool hasDigits = password.contains(new RegExp(r'[0-9]'));
  bool hasLowercase = password.contains(new RegExp(r'[a-z]'));
  bool hasSpecialCharacters = password.contains(new RegExp(r'[!@#$%^&*(),.?":{}|<>]'));
  bool hasMinLength = password.length > minLength;

  return hasDigits & hasUppercase & hasLowercase & hasSpecialCharacters & hasMinLength;
}

Superb! Thanks a lot

This is great! My 5 cents:

bool isPasswordCompliant(String password, [int minLength = 8]) {
  if (password == null || password.length < minLength) {
    return false;
  }

  bool hasUppercase = password.contains(RegExp(r'[A-Z]'));
  if (hasUppercase) {
    bool hasDigits = password.contains(RegExp(r'[0-9]'));
    if (hasDigits) {
      bool hasLowercase = password.contains(RegExp(r'[a-z]'));
      if (hasLowercase) {
        bool hasSpecialCharacters = password.contains(RegExp(r'[!@#$%^&*(),.?":{}|<>]'));
        return hasSpecialCharacters;
      }
    }
  }

  return false;
}

Clear and succinct ;)

  bool isPasswordValid(String password) {
    if (password.length < 8) return false;
    if (!password.contains(RegExp(r"[a-z]"))) return false;
    if (!password.contains(RegExp(r"[A-Z]"))) return false;
    if (!password.contains(RegExp(r"[0-9]"))) return false;
    if (!password.contains(RegExp(r'[!@#$%^&*(),.?":{}|<>]'))) return false;
    return true;
  }

This uses the fail fast pattern which doesn't even waste time trying to compute the longer validations if one of the previous ones is false already ^^

Nice!

main(List args) {
var newtype = NewPassword("Rohit@123");
print(newtype);
}

NewPassword(String Password, [Length = 8]) {
if (Password.length >= Length &&
Password.contains(RegExp('[A-Z]')) &&
Password.contains(RegExp('[a-z]')) &&
Password.contains(RegExp('[0-9]')) &&
Password.contains(RegExp('[!@#%^&*(),.?":{}|<>]'))) {
return true;
} else {
return false;
}
}

validator: (value) {
if (value.lenght > 8){
return "A senha deve ter no mínimo 8 caracteres";
}
if (!RegExp(r'^(?=.?[A-Z])(?=.?[a-z])(?=.?[0-9])(?=.?[!@#$&*~]).{8,}$')
.hasMatch(value)) {
return "A senha deve conter caracteres especias, maiúsculas, minúsculas e números)";
}
return null;
},

what about a single quote?

This works as as I expected to.

RegExp(r"^(?=.[a-z])(?=.[A-Z])(?=.*\d)[a-zA-Z\d\w\W]{8,}$")

all in one

min 8
uppercase
lowercase
special charecter
number

code can be

if(password.containes(RegExp(r"^(?=.[a-z])(?=.[A-Z])(?=.*\d)[a-zA-Z\d\w\W]{8,}$")))
{
// valid
} else
{
// not valid
}

Author

I asked ChatGPT to do this again

Question:
Write a c# code to validate password with the following requirements
Password should be more than 8 characters long
It should contain
at least one Uppercase ( Capital ) letter
at least one lowercase character
at least digit and
special character.

Here is what chatGPT answered

Here is a sample code to validate password in C# using a regular expression pattern:

using System;
using System.Text.RegularExpressions;

namespace PasswordValidation
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(IsPasswordValid("Password123#"));
            Console.WriteLine(IsPasswordValid("password123#"));
            Console.WriteLine(IsPasswordValid("PASSWORD123#"));
            Console.WriteLine(IsPasswordValid("Password123"));
            Console.WriteLine(IsPasswordValid("password123"));
        }

        static bool IsPasswordValid(string password)
        {
            string pattern = @"^(?=.*[A-Z])(?=.*[a-z])(?=.*\d)(?=.*[^\w\d\s]).{8,}$";
            Regex regex = new Regex(pattern);
            return regex.IsMatch(password);
        }
    }
}

This code uses a regular expression pattern ^(?=.[A-Z])(?=.[a-z])(?=.\d)(?=.[^\w\d\s]).{8,}$ to check for the required conditions:

(?=.[A-Z]) checks for at least one uppercase letter
(?=.[a-z]) checks for at least one lowercase letter
(?=.\d) checks for at least one digit
(?=.[^\w\d\s]) checks for at least one special character
.{8,} checks for a minimum length of 8 characters.
The function IsPasswordValid uses the Regex.IsMatch method to check if the password string matches the pattern.