[texdoc] texdoc and regexes

[Karl Berry]

Manuel,

The number of people in the world who know Lua regexes is vanishingly
small compared to the number of people who know normal regexes.  I know
Roberto has his own regex stuff, Lpeg, etc., etc., and standard regexp
support should not be in the Lua core.  Fine.

But isn't there a Lua library for it that we can ship with TL for texdoc
and every other normal program can use?  Can you please look into this?

Thanks,
Karl