Re: confused by the wierd "q" option of "string.format".
[
Date Prev][
Date Next][
Thread Prev][
Thread Next]
[
Date Index]
[
Thread Index]
- Subject: Re: confused by the wierd "q" option of "string.format".
- From: David Manura <dm.lua@...>
- Date: Thu, 7 Jul 2011 19:54:54 -0400
On Thu, Jul 7, 2011 at 4:48 PM, Ross Berteig <Ross@cheshireeng.com> wrote:
> C:...>lua -e "print(string.format('%q','abc\a'))"
> "abc"
> It may or may not have emitted the 007円 represented by the \a, but if so it
> was visually lost (and it didn't even go 'ding' [...]
Trivia question: What does the following program print?
$ cat test.lua
print((('123'):gsub('[^a-z]', '')))
Answer:
$ lua test.lua
abc
Note that test.lua was created using
local fh = assert(io.open('test.lua', 'wb'))
fh:write"print((('abc\b\b\b123'):gsub('[^a-z]', '')))\n"
fh:close()
OTOH,
$ cat -A test.lua
print((('abc^H^H^H123'):gsub('[^a-z]', '')))$