Make tag matching only match contents before first space delimiter.

[timonus]

Right now the full contents between < and > must match in the open and close tags. This could be simplified to be more like HTML by tweaking the regex used by this library.

[timonus]

Idea is that you could do something closer to regular html like

<a href="mylink">Text!</a>

Currently this isn't supported because the opening and closing tags need to be identical.