SimpleValidationLibrary 6.1.0

Simple Validation Library

A lightweight .NET library for validating emails, region-aware phone numbers, dates, and custom regex-based rules — with clear, typed exceptions instead of boolean guesswork.

Features

• Email validation — IsValidEmail
• Phone number validation with regional rules (USA, UK, Spain, Ireland) — IsValidPhoneNumber
• Postal code validation with regional rules (USA, UK, Spain, Ireland) — IsValidPostalCode
• Date validation — IsValidDate
• URL validation (http/https) — IsValidUrl
• Credit card number validation (Luhn checksum) — IsValidCreditCardNumber
• Password strength validation (configurable rules) — IsValidPassword
• IP address validation (IPv4 and IPv6) — IsValidIPAddress
• Numeric range validation — IsInRange
• String length validation — IsValidLength
• Custom validations — register your own named regex rules via IsValidCustom
• Typed exceptions (ValidationException, UnsupportedRegionException) for precise error handling

Installation

dotnet add package SimpleValidationLibrary

Usage

using ValidationLibrary;

// Email
Validator.IsValidEmail("user@example.com"); // returns true, or throws Validator.ValidationException

// Phone number (region-aware)
Validator.IsValidPhoneNumber("612345678", RegionEnum.Region.Spain);

// Postal code (region-aware)
Validator.IsValidPostalCode("28001", RegionEnum.Region.Spain);

// Date
Validator.IsValidDate("2026-01-15");

// URL
Validator.IsValidUrl("https://example.com");

// Credit card number (Luhn checksum)
Validator.IsValidCreditCardNumber("4111 1111 1111 1111");

// Password strength (configurable)
Validator.IsValidPassword("Str0ng!Pass");
Validator.IsValidPassword("simplepass", minLength: 6, requireUppercase: false, requireDigit: false, requireSpecialChar: false);

// IP address (IPv4 or IPv6)
Validator.IsValidIPAddress("192.168.1.1");

// Numeric range
Validator.IsInRange(5, 1, 10);

// String length
Validator.IsValidLength("hello", 1, 10);

// Custom rule
Validator.CustomValidations["digits-only"] = @"^\d+$";
Validator.IsValidCustom("12345", "digits-only");

Handling validation errors

try
{
    Validator.IsValidEmail("not-an-email");
}
catch (Validator.ValidationException ex)
{
    Console.WriteLine(ex.Message); // "Invalid email."
}

Requirements

• .NET 8.0, 9.0, or 10.0

Source & issues

https://github.com/AdrianBailador/SimpleValidationLibrary

License

MIT