dsturm

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

doublesharp

<h4>Validated Field Add-On</h4>
<p>The <strong>Validated Field</strong> add-on for <a href="https://wordpress.org/extend/plugins/advanced-custom-fields/" rel="ugc">Advanced Custom Fields</a><br />
provides a wrapper for other input types which allows you to provide client side input masking using the jQuery<br />
<a href="http://digitalbush.com/projects/masked-input-plugin/" rel="nofollow ugc">Masked Input Plugin</a>, server side validation using either PHP regular expressions<br />
or PHP code, the option of ensuring a field’s uniqueness for all posts by <code>post_type</code> and <code>meta_key</code>, <code>post_type</code>, or site wide, or a<br />
single post by meta_key, as well as marking a field as read-only. Edit your fields in the ACF Field Group editor and update code using the ACE.js<br />
IDE with autocomplete and syntax validation.</p>
<h4>Features</h4>
<ol>
<li><strong>Input Masking</strong> – easily set masks on text inputs to ensure data is properly formatted.</li>
<li><strong>Server-Side Validation</strong> – validate the inputs using server side PHP code or regular expressions.</li>
<li><strong>Uniqueness</strong> – ensure that the value being updated is not already in use.</li>
<li><strong>Repeater Fields</strong> – validated fields within a <a href="http://www.advancedcustomfields.com/add-ons/repeater-field/" rel="nofollow ugc">Repeater Field</a>.</li>
<li><strong>Read Only</strong> – specify a field as read-only allowing it to be displayed but not updated.</li>
<li><strong>WordPress Multi Language</strong> – compatible with multilingual sites using the WPML plugin.</li>
<li><strong>Conditional Logic</strong> – show and hide validated fields based on the values of other “switch” fields.</li>
</ol>
<h4>Compatibility</h4>
<p>Requires <a href="https://wordpress.org/extend/plugins/advanced-custom-fields/" rel="ugc">Advanced Custom Fields</a> version 4.0 or greater.</p>


Advanced Custom Fields: Validated Field

Adding my one star to inform people that this plugin is no longer working

Doesn't work in ACF Pro 5.6.2

The Validated Field add-on for Advanced Custom Fields provides input masking and server-side validation of other field types.

Regex Validation for Gravity Forms vs Advanced Custom Fields: Validated Field