Validates IPv4 and IPv6 addresses

Rails plugin that provides a validates_ip_format_of method to ActiveRecord models. IPs are validated by regexp. IP validation. Validate IP.

To prevent noobs from being uber noobs

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

Validate specific value for Rails

Validate phone numbers against E.164 format with this Ruby on Rails gem

Validate against blacklist of words

Add to Rails the possibility to validate the quantity of an associate model

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

Validate Your Social Security Number

Add common validations.

Subdomain validator

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.

ValidatesTimeliness mongoid ORM compatability.

Makes boolean validations a little cleaner.

Parse numbers suffixed with mangitude specifiers and/or abbreivations.

Library for validating unchangeable attributes.

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

Validate XML against it's embedded XSI elements that define the XSD's.