正規表現

context に正規表現を定義しておく

{ "output": { "text": "Please ask me a question." }, "context": { "rx": "fish|[0-9]+" } }

condition 部で利用する

input.text.matches(context.rx)

Watson Conversation: condition matching input to context array - Stack Overflow

http://stackoverflow.com/questions/39692353/watson-conversation-condition-matching-input-to-context-array?rq=1