Adds ActiveModel validators for common instant messaging services like Discord, Telegram, Matrix, and Signal (as well as legacy services like AIM, Yahoo!, and Skype).

Validates IPv4 and IPv6 addresses

Validates uniqueness of has_many children

Rails 3 profanity validator for active model

To prevent noobs from being uber noobs

ActiveModel validator that ensures Word-tags hasn't been accidentally pasted into WYSIWYG attributes.

Validates Panamanian Identity Document and test it with matchers in a simple way.

Validates Panamanian Single Taxpayer Registry Document and test it with matchers in a simple way.

This gem unions a server-side ActiveModel password strength validation plugin with a client-side password strength estimation

Validate against blacklist of words

Validates mexican RFC and test it with matchers in a simple way.

Uses the power and familiarity of ActiveModel::Validations to validate hash structures. Designed for detecting and providing feedback on bad requests to your RESTful Web Service.

This library helps validate that an attribute is a subset of a specified set

Validates Telephone for Brazil and United States and test it with matchers in a simple way.

Library for validating unchangeable attributes.

Validates if an attribute has a valid xml content or a xsd valid content.

Adds validation methods considering different country zip code formats. Currently, we can validate 130 countries.

Provides an extensible hook for adding custom html attributes to input elements based on validation rules defined in your model.

Delegates validation between objects

validation_examples_matcher provides rspec matcher testing validations with examples.