Regex-based conditioning allows you to trigger the Chatbot flow using regular expressions (regex), which are strings of words. This makes your Chatbot more accessible to end-users by triggering it anytime the user sends a message containing the words specified in your regex.
For example, let's consider you run a plant gifts shop and have set up regex-based conditioning by entering the keyword 'Plant gifts'. If a user sends you a message with the phrase 'Plant gifts' in it, your Chatbot will trigger. For instance, if a user sends 'I want to buy plant gifts', the Chatbot will be triggered since it contains the words specified in the regex.
You can create & test your Regex through this website:
https://regex101.com/