I'm having great trouble to understand this Web site. The earliest point
that I don't understand is this:
> a pattern with the string to be handled (here ck);
What is “ck” in “here ck”: the pattern (and the string to be handled is
contained in ck, i.e., one of the four substrings of ck) or the string to
be handled itself?
Sorry, I don’t understand what those “four substrings of ck” are,
but anyway, “ck” is a lua pattern, in this case matching the string
“ck”.
What exactly is the said replacement and what is the said list in { no = c,
pre = k- },{} ?
As explained in the page, it defines a discretionary. The three
parameters of a discretionary are explained in the TeXbook, p. 95,
or:
http://latexref.xyz/_005cdiscretionary.html
Javier
