email validation

Validations, except they don't do anything.

A simple js form validation

ENV var to Config object translation with validations.

Collection of validations and complex assertions

Json Schema Client is a Ruby client for JsonSchema with validation and hypermedia.

Validation of popular Polish codes, such as PESEL, NIP, REGON, post codes, car registration numbers, credit card numbers and anything really that can be helpful in advanced commercial application for Polish customers.

Plinko helps you create validators that collect all validation errors instead of breaking on the first failure.

Create K-fold splits from data files and assist in training and testing (useful for cross-validation in supervised machine learning)

If you want to decouple validations from model it would be probably the easiest solution

Logstash filter plugin for Auth0 JWT validation.

Generates a Dry::Struct object from Dry::Validation::Contract schemas to avoid repetition when passing DTO's to your services.

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.

numberjack validation lib

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

Numero: Phone number validation for Ruby/Rails

Shared CarrierWave and Validations and Configurations

[Deprecated] Flexible, Easy Function Parameters with Validation.

Validation errors explanation done in good way for Padrino framework.