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- Subject: Re: Pattern matching
- From: Pedro Miller Rabinovitch <pedro@...>
- Date: Tue, 13 Mar 2001 22:30:39 -0300
How do I specify a pattern for a Lua keyword?
How do I say that either the keyword begins a line or is
preceded by a character matching [^%w_], and that either
it ends a line or is followed by a character matching [^%w_],
Let's hope I didn't get this wrong. From what I read above, in:
txt = "This is a test.Another\n_word1.2works.well"
You want to match:
Hence not matching `2works'. Right?
See if this works for you:
ptrn = "[^%w_]([%a_][%w_]*)"
gsub("\000"..txt, ptrn, print)
The "\000" at the beginning anchors the first answer correctly, since
(AFAIK) we can't make use of '^'. Note that I haven't added the
ending "[^%w_]" at the end of the pattern, since it would mean
trouble with words separated by a single character. But it should
work fine, anyway, since gsub() tries to match as many characters as
It would be useful to have a little dictionary of useful
patterns on the Lua website.
Agreed! People should send them in to lhf for the next LTN. :-) I'll
see if I have any interesting ones sitting around here.
Hope I've been of assistance,
(and not totally off-track!)
Pedro Miller Rabinovitch
Gerente Geral de Tecnologia