my wiki now has public and hidden sections

[gusl]

I can now use regular expressions when whitelisting my wiki pages, which means that I now have sections of the wiki that are publically-viewable-by-default, e.g. Public/*, despite having disabled read permissions by default... This required a very small adaptation to Jan Wedekind's hack, namely introducing a separator character in the preg_match call (I chose "&", since I don't intend to have that in any page names).