Linkify take a piece of text and a regular expression and turns all of the regex matches in the text into clickable links. This is particularly useful for matching things like email addresses, web URLs, etc. and making them actionable. Alone with the pattern that is to be matched, a URL scheme prefix is also required. Any pattern match that does not begin with the supplied scheme will have the scheme prepended to the matched text when the clickable URL is created. For instance, if you are matching web URLs you would supply the scheme http://. If the pattern matches example.com, which does not have a URL scheme prefix, the supplied scheme will be prepended to create http://example.com when the clickable URL link is created.