Are you just looking to drag this argument out or do you honestly not understand why the PCRE documentation isn't included in mIRC?
PCRE's documentation isn't included in mIRC's help file for the same reason that the HTTP protocol documentation isn't included in mIRC's help file for the very same reason that the detailed instructions needed to write a mIRC-compatible DLL to control a robotic arm that I stole from NASA to open up my fridge and deliver me a cold beer upon request aren't included in mIRC's help file.
All three are equally beyond the scope of what mIRC's documentation.
Khaled documents features he's added to let scripters know how he's chosen to implement a certian feature. The burdon falls on the scripters to understand why you'd want to use the feature and what is possible when using the feature. The same is true of every language in existance.
-c
