## User-Defined Slots

_User-Defined Slots_ are custom Slots based on your vocabularies or regular expressions, allowing detection of specific phrases, entities, or domain-specific terms. In Cognigy.AI, you can create the following user-defined Slots:

- [Lexicon Slots](https://docs.cognigy.com/ai/platform-features/nlu/slots/user-defined/lexicon) — specific words or phrases (and their variations) from a custom word list.
- [Regex Slots](https://docs.cognigy.com/ai/platform-features/nlu/slots/user-defined/regex) — structured patterns, like phone numbers or emails, using regular expressions.

Last modified on April 21, 2026.