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[Bot can`t extract entities in Tutorial: Building Assistants](https://forum.rasa.com/t/bot-can-t-extract-entities-in-tutorial-building-assistants/32617)

post by swel4ik on Aug 15, 2020

Hi, I do Tutorial: Building Assistants. Bot can extract only entities which in nlu.md file, but it can’t extract new value on entity: For example: maxmeier@firma.de - so if i tell this email, bot extract it, because this email is in train data, but when i give a new email: ragnarek200@yandex.ru i got the error. So i can`t understand why bot can’t extract this entity. On the screenshot you can see same error:

Screenshot_191053×294 29.6 KB](https://europe1.discourse-cdn.com/flex013/uploads/rasa/original/2X/f/f3fa143768255ec6b7d2bcff248198f9c3bda367.png "Screenshot_19")

12 days later

post by pranavinu on Aug 28, 2020

you can use regular expressions to define the entity. Hope it will work Link is here Training Data Format