What does regex [*\f]+ mean?

Question

In the org-mode the outline-regexp variable is set to "[*\f]+".

I am not able to figure out what it stands for, referred this without success.

Edit:- [*\f]+ changed to "[*\f]+"

Answer 1

\f stands for form feed, which is a special character used to instruct the printer to start a new page.

[*\f]+ Then means any sequence entirely composed of * and form feed, arbitrarily long.

Answer 2

The default value matches asterisks and page breaks: "[*\f]+"

http://www.emacswiki.org/emacs/OutlineMode#toc2