Hi all, I'm not sure why but I assumed gsub! would allow me to replace
\n with line feeds or \r for carriage returns.
How do I gsub! and replace everything with a nonvisible character like
newline? I was using this results.gsub!("\n","\n") but obviously that
does not work 
also tried results.gsub!("\n",10.chr). No go.
Kinda of frustrating for something so simple. I guess I could always do
some recursion. Thanks.
--
Posted via http://www.ruby-forum.com/.
Are you trying to turn this:
Hello,
World
Into something like:
Hello,\nWorld
If so, you need to change "\n" (1 character string) into "\\\\n" (3 character string, two escaped backslashs and the letter 'n'). The replacement string will undergo two different interpretations: as a string literal "\\\\n" becomes \\n which when interpreted as a replacement for a regexp undergoes another round (so that things like \1 and \2 can reference groups in the regexp) and becomes \n
Yes, this is tricky, but it's because there are two levels of escaping going on and both use the backslash.
-Rob
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
On Jan 19, 2009, at 7:19 PM, Simon Tan wrote:
Hi all, I'm not sure why but I assumed gsub! would allow me to replace
\n with line feeds or \r for carriage returns.How do I gsub! and replace everything with a nonvisible character like
newline? I was using this results.gsub!("\n","\n") but obviously that
does not workalso tried results.gsub!("\n",10.chr). No go.
Kinda of frustrating for something so simple. I guess I could always do
some recursion. Thanks.
--
Hi,
Hi all, I'm not sure why but I assumed gsub! would allow me to replace
\n with line feeds or \r for carriage returns.
str.gsub! "\\n", "\n"
str.gsub! "\\r", "\r"
This is a security risk:
eval %Q("#{str}")
Maybe this does:
str = "hello\\nbye"
str.gsub! /\\(\w)/ do |m| eval '"\\' + $1 + '"' end
Okay, \ escaping is a weird matter.
You know that gsub! returns nil in case nothing was changed?
Bertram
Am Dienstag, 20. Jan 2009, 09:19:02 +0900 schrieb Simon Tan:
--
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de
Simon Tan wrote:
If you want to substitute
Hello\nWorld by
Hello
World
you should try to work with single quotes:
a = 'Hello\nWorld'
Simon Tan wrote:
=> "Hello\\nWorld"
irb(main):002:0> puts a
Hello\nWorld
=> nil
irb(main):003:0> a.gsub!('\n',"\n")
=> "Hello\nWorld"
irb(main):004:0> puts a
Hello
World
Hi all, I'm not sure why but I assumed gsub! would allow me to replace
\n with line feeds or \r for carriage returns.How do I gsub! and replace everything with a nonvisible character like
newline? I was using this results.gsub!("\n","\n") but obviously that
does not workKinda of frustrating for something so simple. I guess I could always do
some recursion. Thanks.
Simon Tan wrote:
I'm not sure why but I assumed gsub! would allow me to replace
\n with line feeds
"\n" *is* a line feed.
string = "hello\nworld"
=> "hello\nworld"
puts string
hello
world
=> nil
HTH,
Sebastian
--
NP: Dire Straits - Brothers In Arms
Jabber: sepp2k@jabber.org
ICQ: 205544826
haha actually, the other way around 
I have a string(I believe...I'm
using Hpricot to retreive web pages and it likes to add slashes to
everything). For example, I want to change "Hello, \nWorld" by changing
\n into a newline. So the output should be like:
Hello
World
I did try your suggestion, but I get "Hello\\nWorld". Will keep playing
with the slashes.
Rob Biedenharn wrote:
On Jan 19, 2009, at 7:19 PM, Simon Tan wrote:
--
Are you trying to turn this:
Hello,
WorldInto something like:
Hello,\nWorld
If so, you need to change "\n" (1 character string) into "\\\\n" (3
character string, two escaped backslashs and the letter 'n'). The
replacement string will undergo two different interpretations: as a
string literal "\\\\n" becomes \\n which when interpreted as a
replacement for a regexp undergoes another round (so that things like
\1 and \2 can reference groups in the regexp) and becomes \nYes, this is tricky, but it's because there are two levels of escaping
going on and both use the backslash.-Rob
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
--
Posted via http://www.ruby-forum.com/\.
Are you seeing something like:
look = 'here is a " and I\'ll put a \' here, too'
=> "here is a \" and I'll put a ' here, too"
puts look
here is a " and I'll put a ' here, too
=> nil
The rules for what needs to be escaped depend on the kind of quotes used.
Are you seeing output that is shown in double quotes to indicate that it is a string?
-Rob
On Jan 19, 2009, at 8:16 PM, Simon Tan wrote:
haha actually, the other way around
using Hpricot to retreive web pages and it likes to add slashes to
everything). For example, I want to change "Hello, \nWorld" by changing
\n into a newline. So the output should be like:
Hello
WorldI did try your suggestion, but I get "Hello\\nWorld". Will keep playing
with the slashes.Rob Biedenharn wrote:
On Jan 19, 2009, at 7:19 PM, Simon Tan wrote:
--
Are you trying to turn this:
Hello,
WorldInto something like:
Hello,\nWorld
If so, you need to change "\n" (1 character string) into "\\\\n" (3
character string, two escaped backslashs and the letter 'n'). The
replacement string will undergo two different interpretations: as a
string literal "\\\\n" becomes \\n which when interpreted as a
replacement for a regexp undergoes another round (so that things like
\1 and \2 can reference groups in the regexp) and becomes \nYes, this is tricky, but it's because there are two levels of escaping
going on and both use the backslash.-Rob
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com--
Posted via http://www.ruby-forum.com/\.
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
+1 513-295-4739
Skype: rob.biedenharn
Simon Tan wrote:
I have a string(I believe...I'm
using Hpricot to retreive web pages and it likes to add slashes to
everything). For example, I want to change "Hello, \nWorld" by changing
\n into a newline.
Perhaps there's a misunderstanding here. I doubt Hpricot adds anything.
If you see this "Hello, \nWorld" in 'irb' then that's because 'irb'
shows you the string in the way you'd write it in your source-code. The
two characters "\n" are actually a newline.
--
Posted via http://www.ruby-forum.com/\.
Ok, I just realized I've been using p to print everything out! "Puts"
works a whole lot better. Doh! Thanks for all the help. Sorry for
phrasing the question poorly 
--
Posted via http://www.ruby-forum.com/.
LOL!
On Jan 24, 2009, at 7:25 PM, Simon Tan <simon1tan@yahoo.com> wrote:
Ok, I just realized I've been using p to print everything out! "Puts"
works a whole lot better. Doh! Thanks for all the help. Sorry for
phrasing the question poorly--
Posted via http://www.ruby-forum.com/\.