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- Subject: Formatted input
- From: Dirk Laurie <dpl@...>
- Date: Mon, 22 Nov 2010 23:55:08 +0200
Lua has something like C's sprintf, i.e. string.format, but
not like C's sscanf.
1. Surely someone has published the Lua patterns that match valid
signed and unsigned integers, and F-formatted and E-formatted floats?
2. With the aid of those, I think I can mimic sscanf by exploiting the
unused %A to %Z syntax space in string.match. I make a table called
_format such that _format.E is the pattern that captures E-format,
getmetatable("").__call = function (string,format)
for f,p in pairs(_format) do format = format:gsub('%%'..f,p) end
print(format); return string:match(format)
allows me to say e.g.
line = '1.2e2 3.1416'
x,y = line('%E%s+%F')
I would like to say line:scan but assigning to getmetatable("").scan
causes no error but line:scan is still nil.