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Fred Bayer wrote:
> BTW, what's the matter with the "frontier pattern" %f? It's in the 
> source but not documented anywhere.

Looking at the source I would say its syntax is %f[set] and
it matches the transition from "not in set" to "in set".
I.e. %f[%w] matches the start and %f[%W] the end of a "word".

Ciao, ET.