!!! Overview
[{$pagename}] is a Alphabetic [character] as defined in [ABNF] ([RFC 5234]) as:\\
ALPHA =  %x41-5A / %x61-7A   ; A-Z / a-z


Using [Regular expression] it is oftne shown as [[A-Z][[a-z]

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]