RE: The frontier pattern %f
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- Subject: RE: The frontier pattern %f
- From: "Aaron Brown" <arundelo@...>
- Date: 2006年12月27日 13:18:34 -0500
Mildred wrote:
Browsing the wiki, I discovered the frontier pattern. But
I can't find it in the reference manual ? Why not include
it ?
Roberto says[1]
It is not documented because we are not sure it is worth
providing this kind of facility.
In the upcoming book on Lua that I coauthored[2], we
describe how to use it, and give the following warning:
The fact that %f is undocumented means that it may --
without notice -- change or disappear altogether in a
subsequent release of Lua. It also means that there?s no
explicit guarantee of its behavior, and it may act
unexpectedly when used in unusual situations:
> -- This should find the empty string at the beginning of the
> -- subject, but it doesn't (due to an implementation quirk):
> print(string.find("0円", "%f[%z]"))
nil
[1] http://lua-users.org/lists/lua-l/2004-09/msg00294.html
[2] http://www.amazon.com/gp/product/0470069171/
--
Aaron
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