Regex Password Validation — Strong Password Patterns

JavaScript

// Strong password: 8+ chars, upper, lower, digit, special
const strongPassword = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[!@#$%^&*()_+\-=]).{8,}$/;

function validatePassword(password) {
  return {
    valid: strongPassword.test(password),
    minLength: password.length >= 8,
    hasUppercase: /[A-Z]/.test(password),
    hasLowercase: /[a-z]/.test(password),
    hasDigit: /\d/.test(password),
    hasSpecial: /[!@#$%^&*()_+\-=]/.test(password),
  };
}

console.log(validatePassword("Hello@123"));
// { valid: true, minLength: true, hasUppercase: true, ... }

Python

import re

def validate_password(password):
    checks = {
        "min_length": len(password) >= 8,
        "has_uppercase": bool(re.search(r'[A-Z]', password)),
        "has_lowercase": bool(re.search(r'[a-z]', password)),
        "has_digit": bool(re.search(r'\d', password)),
        "has_special": bool(re.search(r'[!@#$%^&*()_+\-=]', password)),
    }
    checks["valid"] = all(checks.values())
    return checks

print(validate_password("Hello@123"))
# {'min_length': True, 'has_uppercase': True, ..., 'valid': True}