LPeg and whitespace removal

[Joshua Jensen <jjensen@...>]

As my first attempt at using LPeg, I took the Splitting a String example 
and wanted to extend it to filter out whitespace on either side of the 
string.  All whitespace (represented as a visible *) is removed from the 
pattern below except the whitespace at the end.  I understand why it 
doesn't work; I don't understand how to make an elegant fix for it.  I 
tried all kinds of approaches without success.

ws = lpeg.P('*')^0
sep = ws * lpeg.P(',') * ws
elem = (lpeg.C((1 - sep)^0))
p = ws * elem * (sep * elem)^0
print(p:match('*abcd**,*efgh,***ijklm******'))

Can anyone clue me in?

Thanks!

Josh