Ok. I have a major pattern matching problem. In essence, right now the word i am trying to match is "hello", WITH double quotes around it.
Why isn't this working? It always hits the else part of my case-when loop.
write_file = open('albuminfo.txt', 'w')
lines.each do |line|
puts line
case line
when line =~ /^(.+)$/
write_file.puts('"#{$1}"')
write_file.close
print '.'
else
print '$'
end
end
It doesn't want to match!
Please don't let me drown,
---------------------------------------------------------------|
~Ari
"I don't suffer from insanity. I enjoy every minute of it" --1337est man alive
Hi --
Ok. I have a major pattern matching problem. In essence, right now the word i am trying to match is "hello", WITH double quotes around it.
Why isn't this working? It always hits the else part of my case-when loop.
write_file = open('albuminfo.txt', 'w')
lines.each do |line|
puts line
case line
when line =~ /^(.+)$/
write_file.puts('"#{$1}"')
write_file.close
print '.'
else
print '$'
end
It doesn't want to match!
You're using case/when wrong. You've got:
case line
when (some expression that is nil or an integer) ....
So you're really saying:
if (nil or integer) === line
You can either use a base case:
case
when line =~ /.../
or just use if/else, which to me seems more straightforward here.
David
···
On Fri, 6 Jul 2007, Ari Brown wrote:
--
* Books:
RAILS ROUTING (new! http://www.awprofessional.com/title/0321509242\)
RUBY FOR RAILS (http://www.manning.com/black\)
* Ruby/Rails training
& consulting: Ruby Power and Light, LLC (http://www.rubypal.com)
Others have pointed out a problem with your case statement, but I think there's another problem here -- your #{$1} substitution isn't going to work in single-quoted string.
Regards, Morton
···
On Jul 5, 2007, at 8:50 PM, Ari Brown wrote:
Ok. I have a major pattern matching problem. In essence, right now the word i am trying to match is "hello", WITH double quotes around it.
Why isn't this working? It always hits the else part of my case-when loop.
write_file = open('albuminfo.txt', 'w')
lines.each do |line|
puts line
case line
when line =~ /^(.+)$/
write_file.puts('"#{$1}"')
write_file.close
print '.'
else
print '$'
end
end
Hi,
> when line =~ /^(.+)$/
> write_file.puts('"#{$1}"')
Others have pointed out a problem with your case statement, but I
think there's another problem here -- your #{$1} substitution isn't
going to work in single-quoted string.
Further, the grouping is superfluous.
when /^.+$/ then
do_sth_with $&
will do.
As `line' will alwas contain a single newline character at
the strings end and as /./ will never match that, even
when /.+/ then
will do.
Bertram
···
Am Freitag, 06. Jul 2007, 12:27:40 +0900 schrieb Morton Goldberg:
On Jul 5, 2007, at 8:50 PM, Ari Brown wrote:
--
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de
<snip>
Others have pointed out a problem with your case statement, but I think there's another problem here -- your #{$1} substitution isn't going to work in single-quoted string.
You're serious? I can't use variable substitution in a single quoted string? I ran into that a while ago, but i just thought it was some glitch on my part!
Why is that so? Whats the difference between single and double quoted strings?
Thanks
-------------------------------------------------------|
~ Ari
crap my sig won't fit
···
On Jul 5, 2007, at 11:27 PM, Morton Goldberg wrote:
<snip>
Others have pointed out a problem with your case statement, but I think there's another problem here -- your #{$1} substitution isn't going to work in single-quoted string.
You're serious? I can't use variable substitution in a single quoted string? I ran into that a while ago, but i just thought it was some glitch on my part!
Dead serious. However, the following may suggest a solution to you:
foo = 42
puts %["#{foo}"]
Why is that so?
I suspect it's to allow us to print strings verbatim.
Whats the difference between single and double quoted strings?
I believe single-quoted strings have only one special character -- the single quote.
Regards, Morton
···
On Jul 6, 2007, at 11:42 AM, Ari Brown wrote:
On Jul 5, 2007, at 11:27 PM, Morton Goldberg wrote:
Actually the difference is exactly that!
Diego Scataglini
···
On Jul 6, 2007, at 11:52 AM, Bertram Scharpf <lists@bertram- scharpf.de> wrote:
Hi,
Am Samstag, 07. Jul 2007, 00:42:24 +0900 schrieb Ari Brown:
You're serious? I can't use variable substitution in a single quoted
string? [...]
Why is that so? Whats the difference between single and double quoted
strings?
RTFM!
<Programming Ruby: The Pragmatic Programmer's Guide;
Bertram
--
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de
And the backslash is a bit special:
'n' => "n"
'\'' => "'"
'\\' => "\\"
'\n' => "\\n" # because the \ is only special for \ and '
-Rob
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
···
On Jul 6, 2007, at 2:54 PM, Morton Goldberg wrote:
On Jul 6, 2007, at 11:42 AM, Ari Brown wrote:
I suspect it's to allow us to print strings verbatim.
Whats the difference between single and double quoted strings?
I believe single-quoted strings have only one special character -- the single quote.
Regards, Morton
You're right, I should have said there are two special characters -- single quote and backslash.
Regards, Morton
···
On Jul 6, 2007, at 5:40 PM, Rob Biedenharn wrote:
On Jul 6, 2007, at 2:54 PM, Morton Goldberg wrote:
On Jul 6, 2007, at 11:42 AM, Ari Brown wrote:
I suspect it's to allow us to print strings verbatim.
Whats the difference between single and double quoted strings?
I believe single-quoted strings have only one special character -- the single quote.
Regards, Morton
And the backslash is a bit special:
'n' => "n"
'\'' => "'"
'\\' => "\\"
'\n' => "\\n" # because the \ is only special for \ and '
(see my post which mentioned two solutions but not this