What input does this expect?

This is a line from a Screwturn wiki plugin for section transclusion:

Code:

---

new Regex(@"\{T(?:\:|\|)(?<page>[^}#]+)(?:\#(?<section>[^}#]+))?}"

---

I can't work out what markup it is expecting. The standard markup for a full page transclusion is:

Code:

---

{t:<pageToTransclude>}

---

The full source is here: http://scruwturn-plugins-ds.googleco...ransclusion.cs