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Last Updated: June 16, 2026
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Drupal: Form api custom validation function doesn't work
Drupal 9 custom form validations.| Form Part-2
![8/22 How to create a custom validation constraint with Drupal 9 & 10 entities [ preview ]](https://ytimg.googleusercontent.com/vi/41pLu3mnY4s/mqdefault.jpg)
8/22 How to create a custom validation constraint with Drupal 9 & 10 entities [ preview ]
Add Custom Validation To Content Types Fields Using Constraints in Drupal | Drupal Tutorials
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![8/22 How to create a custom validation constraint with Drupal 9 & 10 entities [ preview ]](https://i0.wp.com/ytimg.googleusercontent.com/vi/41pLu3mnY4s/mqdefault.jpg?resize=320,180)
