RE: The frontier pattern %f

["Aaron Brown" <arundelo@...>]

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", "%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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