> For the complete documentation index, see [llms.txt](https://docs.convai.com/api-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.convai.com/api-docs/plugins-and-integrations/unreal-engine/guides/operations-based-on-the-presence-of-certain-words.md).
# Operations Based on the Presence of Certain Words
This document explains how to detect words and perform certain operations based on it.
* Open your Convai Character blueprint and click on `Class Settings` and then on `ConvaiChatbot` component.
* Under the `Details` section scroll down to the `Events` section and add `On Transcription Received` event.
Add On Transcription Received Event to Event graph.
* Once we have the transcription of player input, we can perform a substring search on it.
Substring search on transciption.
{% hint style="info" %}
The Print String at the end is just an example. You can add your logic after the substring match.
{% endhint %}
---
# Agent Instructions
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