Handle validation, coercion, and attributes.

Tiny plugin for MongoMapper to strip whitespace from strings before validation.

An ActiveModel extension that strips tags from attributes before validation using the strip-tags helper.

This gem covers the generation and validation of the Portuguese Fiscal Code (or NIF). It also includes a rails custom validator.

Heavily armed validation framework.

Provides Argentine phone number parsing, validation, formatting and meta-information.

Numero: Phone number validation for Ruby/Rails

Shared CarrierWave and Validations and Configurations

A TOTP generator, that includes validation, generation and send methods. See https://github.com/fboccacini/onetime-totp for reference and usage.

DSL for method arguments validation and casting

Client side validation with parsley and simple_form.

Phone number validation forked from MOBI Wireless Management

A ruby gem library for that offers utilities, version constraint parsing and validation.

Postcode validation module

Presence at least one validation for ActiveModel

Set of rich helpers for email validation

Provides parsing, validation & accessors

Automatically pass attributes through Sanitize before validation

A schema parsing and validation library for Ruby

Helpful rspec matchers for testing validations and associations.