Regular expression in botlibre chatbots

now botlibre chatbots on botlibre website support regular expression.
here is a link.

I cannot directly link to article.the name of the article is
Parsing natural language using Regular Expression patterns and extractors

It would help if there was a link to an article and an edit to the description to make it more clear and descriptive (for instance, “websight” should be spelled as “website”).