bannersky

This plugin helps you to validate user input and let users submit correct data on Gravity Forms, Formidable Forms. You can apply the defined users to your orders, registration forms, quotations, etc. So you can restrict users to enter correct phone numbers, license numbers, postcodes and VAT numbers for specific regions…
You can also use checkbox rules to require users to read and agree to your terms, privacy policy, etc.
Please review the rules below, we would like to hear your rules request.
<ol>
<li>
Age must between given years old
</li>
<li>
Must be numeric value and between given values
</li>
<li>
Must be given value
</li>
<li>
Length must same as given number
</li>
<li>
The character at the position X must be
</li>
<li>
The character at the reverse position X must be
</li>
<li>
Latitude must be numeric and between given values
</li>
<li>
Longitude must be numeric and between given values
</li>
<li>
Checkbox options must all be checked
</li>
</ol>
We’d like to receive your custom validation request.
*** Please Note that here is the free version, it only has some basic rules, but it can meet the needs of some customers and help them well.
Enjory it!
<h3>Short Description</h3>
This plugin helps you do custom validation to fields of Gravity Forms, Formidable Forms. Sucha as length, numberic value between given values, agae, Latitude & Longitude……

BSK Forms Validation

This plugin helps you to validate user input and let users submit correct data on Gravity Forms, Formidable Forms. You can apply the defined users to  …

brainvireinfo

This plugin adds custom validation messages to individual fields of your contact form 7. You will be able to add your custom error message for every field like text, radio, select, textarea, etc.. in contact form 7.
Features of this plugin.
<ul>
<li>Supported with WPML (Contact Form 7 Multilingual) addon</li>
<li>Add Custom Validation Message to Contact Form Fields.</li>
<li>Allows you to set Different Error Messasge for text, text area, email, URL, radio, phone number, and more fields.</li>
<li>Error message for individual fields.</li>
<li>You can add custom validation with multiple forms on different pages or single page.</li>
</ul>

Custom validation error message – CF7

This plugin provides custom error messages for each field in contact form 7. Also, this plugin supported to "Contact Form 7 Multilingual" addon.

BSK Forms Validation vs Custom validation error message – CF7