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# Dart: Validate Password | |
This code snippet shows how to validate a password | |
**Requirement** : | |
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. | |
void main() { | |
var p = "ComplextPassword@123"; | |
//will print True if password is complient else false | |
print(isPasswordCompliant(p)); | |
} | |
// Password validation function | |
bool isPasswordCompliant(String password) | |
{ | |
bool isComplient = false; | |
bool hasUppercase = false; | |
bool hasDigits = false; | |
bool hasLowercase = false; | |
bool hasSpecialCharacters = false; | |
var character=''; | |
var i=0; | |
print(password); | |
if (! password?.isEmpty) { | |
// Check if valid special characters are present | |
hasSpecialCharacters = password.contains(new RegExp(r'[!@#$%^&*(),.?":{}|<>]')); | |
while (i < password.length){ | |
character = password.substring(i,i+1); | |
print(character); | |
if (isDigit(character , 0)){ | |
hasDigits=true; | |
}else{ | |
if (character == character.toUpperCase()) { | |
hasUppercase=true; | |
} | |
if (character == character.toLowerCase()){ | |
hasLowercase=true; | |
} | |
} | |
i++; | |
} | |
} | |
isComplient = hasDigits & hasUppercase & hasLowercase & hasSpecialCharacters; | |
return isComplient; | |
} | |
bool isDigit(String s, int idx) => | |
"0".compareTo(s[idx]) <= 0 && "9".compareTo(s[idx]) >= 0; |
bool isPasswordCompliant(String password, [int minLength = 6]) { if (password == null || password.isEmpty) { return false; } bool hasUppercase = password.contains(new RegExp(r'[A-Z]')); bool hasDigits = password.contains(new RegExp(r'[0-9]')); bool hasLowercase = password.contains(new RegExp(r'[a-z]')); bool hasSpecialCharacters = password.contains(new RegExp(r'[!@#$%^&*(),.?":{}|<>]')); 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!
+1
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?
good
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
}
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.
extension method:
extension ValidatorExt on String {
// isEmail validator
bool get isEmail {
final emailRegex = RegExp(
r'^[a-zA-Z0-9.]+@[a-zA-Z0-9]+\.[a-zA-Z]+');
return emailRegex.hasMatch(this);
}
// password validator for 8 characters, 1 uppercase, 1 lowercase, 1 number, 1 special character
bool get isPasswordCompliant {
String password = this;
bool hasUppercase = password.contains(RegExp(r'[A-Z]'));
bool hasLowercase = password.contains(RegExp(r'[a-z]'));
bool hasDigits = password.contains(RegExp(r'[0-9]'));
bool hasSpecialCharacters = password.contains(RegExp(r'[!@#$%^&*(),.?":{}|<>]'));
bool hasMinLength = password.length > 8;
return hasUppercase && hasLowercase && hasDigits && hasSpecialCharacters && hasMinLength;
}
}
It should be
bool hasMinLength = password.length >= minLength;