dsturm

Regex Validation for Gravity Forms adds a powerful regex validation option to your Gravity Forms fields. Define custom regular expression patterns or choose from built-in presets to validate user input — both server-side and client-side.
<h4>Features</h4>
<ul>
<li>Custom regex patterns — Add any regular expression to validate field input</li>
<li>Unicode support — Full Unicode character class support (<code>\p{L}</code>, <code>\p{N}</code>) for international names and text</li>
<li>Built-in presets — Quick-select common patterns for names, emails, phone numbers, and more</li>
<li>Server-side validation — Secure PHP validation that can’t be bypassed</li>
<li>Client-side validation — Instant feedback on input change using JavaScript</li>
<li>Compound field support — Works with Name fields (validates each sub-input individually)</li>
<li>Custom error messages — Define user-friendly validation messages per field</li>
<li>Extensible — Add your own presets and field types via filters</li>
<li>Accessible — Error messages use <code>role="alert"</code> for screen readers</li>
</ul>
<h4>Supported Field Types</h4>
<ul>
<li>Text</li>
<li>Name (with individual sub-input validation)</li>
<li>Email</li>
<li>Phone</li>
<li>Website</li>
<li>Textarea</li>
</ul>
<h4>Built-in Presets</h4>
<ul>
<li>Name — Unicode letters, spaces, hyphens, apostrophes</li>
<li>Email — RFC 5322 compliant</li>
<li>US Phone Number — Common US formats</li>
<li>International Phone Number — E.164 format</li>
<li>Alphanumeric — Unicode letters and numbers only</li>
<li>No Special Characters — Unicode letters, numbers, and spaces only</li>
</ul>

Regex Validation for Gravity Forms

Adds custom regex validation with Unicode support and presets to Gravity Forms fields.

Peshmerge Morad

This plugin is created to enable WordPress site owners to specify a regex string to be used with Gravity Forms text fields. 
Once a regex string is specified, the user can’t submit that form until the user enters a text that comply with the regex string.

Regex Textfield: Gravityforms Add-on

A WordPress plugin and GravityForms addon to enable users to use regex string on text input field to control user input.

Regex Validation for Gravity Forms vs Regex Textfield: Gravityforms Add-on