If a var definition RHS contains a ‘=‘, that will act as the end of the definition. Instead it should be part of the variable value. Example:

! var website = https://www.rivescript.com/try/#/doc?x=y&more=more_stuff

+ where is your (website|web site|site)
- <bot website>

User: Where is your site?

Bot: https://www.rivescript.com/try/#/doc?x