https://legacy.forums.gravityhelp.com/topic/custom-field-that-supports-validation-by-regular-expressions Gravity Support Forums Topic: Custom field that supports validation by regular expressions en-US Mon, 20 Apr 2026 01:25:40 +0000 http://bbpress.org/?v=1.0.1 q https://legacy.forums.gravityhelp.com/search.php https://legacy.forums.gravityhelp.com/topic/custom-field-that-supports-validation-by-regular-expressions#post-31166 Thu, 28 Jul 2011 19:56:22 +0000 Anonymous 31166@https://legacy.forums.gravityhelp.com/ <p>Hi Alex, I have a similar question/issue. My client wants us to validate the email field to ensure it's not coming from any free email hosts (they want commercial entities only). Here's their original code snippet for this validation... my question is how do I incorporate this into GF?</p> <p>Validation code snippet can be found here:<br /> <a href="http://dl.dropbox.com/u/19790225/email_form_validation.php" rel="nofollow">http://dl.dropbox.com/u/19790225/email_form_validation.php</a></p> <p>Thanks,</p> <p>Sean </p> https://legacy.forums.gravityhelp.com/topic/custom-field-that-supports-validation-by-regular-expressions#post-12652 Sat, 13 Nov 2010 17:31:40 +0000 Alex Cancado 12652@https://legacy.forums.gravityhelp.com/ <p>Following is a sample code snippet. To get the submitted field value, you can use $_POST["input_XXX"]</p> <pre><code>add_filter(&#39;gform_validation&#39;, &#39;custom_validation&#39;); function custom_validation($validation_result){ // set the form validation to false $validation_result[&quot;is_valid&quot;] = false; $form = $validation_result[&quot;form&quot;]; // specify the first field to be invalid and provide custom validation message $form[&quot;fields&quot;][0][&quot;failed_validation&quot;] = true; $form[&quot;fields&quot;][0][&quot;validation_message&quot;] = &quot;This field is invalid!&quot;; // update the form in the validation result with the form object you modified $validation_result[&quot;form&quot;] = $form; return $validation_result; }</code></pre> https://legacy.forums.gravityhelp.com/topic/custom-field-that-supports-validation-by-regular-expressions#post-12645 Sat, 13 Nov 2010 13:21:39 +0000 kevinmcgillivray 12645@https://legacy.forums.gravityhelp.com/ <p>Hi, Alex. Should I email you to get that snippet of code you mentioned?</p> <p>Thanks!<br /> kcm </p> https://legacy.forums.gravityhelp.com/topic/custom-field-that-supports-validation-by-regular-expressions#post-12512 Thu, 11 Nov 2010 13:56:22 +0000 kevinmcgillivray 12512@https://legacy.forums.gravityhelp.com/ <p>Hi, Alex. Yes, that would be great. Please send me the code snippet.</p> <p>Thanks! </p> <p>kcm </p> https://legacy.forums.gravityhelp.com/topic/custom-field-that-supports-validation-by-regular-expressions#post-12510 Thu, 11 Nov 2010 13:53:53 +0000 Alex Cancado 12510@https://legacy.forums.gravityhelp.com/ <p>That is a good idea, but meanwhile you can add your own custom validation using a hook and a few lines of PHP. If that is something you want to try, I can send you a code snippet. </p> https://legacy.forums.gravityhelp.com/topic/custom-field-that-supports-validation-by-regular-expressions#post-12504 Thu, 11 Nov 2010 13:41:47 +0000 kevinmcgillivray 12504@https://legacy.forums.gravityhelp.com/ <p>Hi there. I'd love to have a field type called "Custom" that allows me to specific my own regular expression for field validation. Seems like it would be a pretty simple thing to add on but I'm just guessing.</p> <p>Gravity Forms rocks!</p> <p>Thanks!<br /> kcm </p>