textbuffer urls

Hi,

I'm building out a textbuffer to be a rich text editor. How do I apply a tag which functions as a link? (For functionality much like the Add Link button at the top of this post...)  Or to put it more technically, how do I apply hyperlinks in textbuffers?

You'd be surprised at how hard it is to google textbuffer & link, or textbuffer & url, or textbuffer & hyperlink, as these always result in posts with people talking about posts regarding textbuffers in general.

And guidance will be much appreciated!

Thanks,