# Rasa NLU in Depth - Part 2: Entity Recognition

**URL:** <https://forum.rasa.com/t/rasa-nlu-in-depth-part-2-entity-recognition/5611>\
**Category:** Tutorials, Resources & Videos\
**Created:** [February 28, 2019, 3:39pm UTC](https://forum.rasa.com/t/rasa-nlu-in-depth-part-2-entity-recognition/5611 "2019-02-28T15:39:38Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![emeariaenea](https://avatars.discourse-cdn.com/v4/letter/e/dc4da7/32.png) [@emeariaenea](https://forum.rasa.com/u/emeariaenea)\
**Post date:** [February 13, 2023, 3:03pm UTC](https://forum.rasa.com/t/rasa-nlu-in-depth-part-2-entity-recognition/5611/12 "2023-02-13T15:03:19Z")

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@luofanghao Hello! Excuse me for bothering you after SO long. I’m trying to solve the issue related to dynamic and random entities. Could you, please, give some advice? **Or explain to me how to use:**

> [@luofanghao](#):
>
> custom slot mapping as : [Forms](https://rasa.com/docs/rasa/core/forms/#validating-user-input)

**I’m sort of desperate!**

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