As you may know in the modules/phpcomic/pndocs directory there is a file : How to grab comics.txt explaining how to add other comics to the phpcomic module.
For the grabPureRegexp method there is an error because it states that the regular expression goes in Argument3 wich is wrong because it goes in Argument4
So the example given should be :
Method=GrabPureRegexp
Argument=http://comicsite/
Argument 2=http://comicsite/comicpage.htm
Argument 3=
Argument 4=[0-9]{4}/wee/wee[0-9]{4}g\.gif

Sorry. I will correct it in the next release.