Skip to main content


Topic Creation & Management

Slot filling with custom regular expression entity

Posted on by



I created a custom regular expression entity "Incident ID" to extract incident tracking numbers:



My bot question "Please enter incident ID"  for extracting the ID recognizes the input, but I don't get the (proactive) slot filling working:

If I enter a trigger phrase like "incident status INC123", the related topic is started, but the question for getting the incident ID is not skipped.


Is the slot filling is only working for custom list entities, but not for regex?


Best regards



  • gregmarbais Profile Picture
    gregmarbais 106 on at
    Re: Slot filling with custom regular expression entity

    Hey Stefan, I don't think any entity recognition is happening even with closed list entities right now. There's a feature idea to allow entity recognition in trigger phrases that you may want to vote on:

    I'm in the same spot as you. I have a manufacturer part number that customers will often enter in the chat ("I want to order part XYZ-123") and the bot will trigger the order parts topic then ask what part number they are looking for when it was in the trigger phrase.

Helpful resources

Quick Links

Exciting News for Copilot Studio Communi…

Get ready to experience a whole new level of engagement with the Copilot Studio…

Celebrating the May Super User of the…

LaurensM is an exceptional contributor to the Power Platform Community…

Check out the Copilot Studio Cookbook…

We are excited to announce our new Copilot Cookbook Gallery in the Community…


renatoromao Profile Picture

renatoromao 6,459

Pstork1 Profile Picture

Pstork1 1,968

Expiscornovus Profile Picture

Expiscornovus 1,680

Featured topics