Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.ruby > #3351 > unrolled thread

Parsing text

Back to article view | Back to comp.lang.ruby

Contents

  Parsing text Cyril Jose <cyril_jose@ymail.com> - 2011-04-21 20:43 -0500
    Re: Parsing text John W Higgins <wishdev@gmail.com> - 2011-04-21 21:08 -0500
    Re: Parsing text 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-21 21:20 -0500
    Re: Parsing text Cyril Jose <cyril_jose@ymail.com> - 2011-04-21 22:15 -0500

#3351 — Parsing text

Hey all,

I have a file where I need to parse information from. The format of the
first line is something like this:

">ruby ruby |ruby|ruby ruby|text_i_want| test test"

I was thinking converting this line into an array, using the .split(//)
and keeping count of the pipe("|") character so that when it reaches the
3rd one, it reads the characters up till the 4th pipe(all in a do
iterator. So in essence, I would want to extract "text_i_want". When i
tried this method, I got stuck. Any ideas on how to move forward? Or an
easier solution than this? Thanks!

-- 
Posted via http://www.ruby-forum.com/.

[toc] | [next] | [standalone]

#3352

[Note:  parts of this message were removed to make it a legal post.]

Good Afternoon,

On Thu, Apr 21, 2011 at 6:43 PM, Cyril Jose <cyril_jose@ymail.com> wrote:

> Hey all,
>
> I have a file where I need to parse information from. The format of the
> first line is something like this:
>
> ">ruby ruby |ruby|ruby ruby|text_i_want| test test"
>
> I was thinking converting this line into an array, using the .split(//)
>

You got close - this should work for you

split(/\|/)[3]

That will return the 4th group of text for you

John

[toc] | [prev] | [next] | [standalone]

#3354

A pipe is one of the special regex characters--it does not stand for a 
literal pipe.  A pipe is used in a regex to mean 'OR'.

There several other ways to escape the special regex characters, so that 
they will lose their special meaning and match themselves:

1)  You can use a backslash to escape the pipe.

2) You can put the pipe in a character class:

str = ">ruby ruby |ruby|ruby ruby|text_i_want| test test"

pieces = str.split(/[|]/)
puts pieces[3]

--output:--
text_i_want

3) You can call Regexp.escape to escape any special regex characters 
contained in the string, so that they lose their special meaning:

str = ">ruby ruby |ruby|ruby ruby|text_i_want| test test"

pattern = "|"
esc_str = Regexp.escape(pattern)

pieces = str.split(/#{esc_str}/)
puts pieces[3]

--output:--
text_i_want

-- 
Posted via http://www.ruby-forum.com/.

[toc] | [prev] | [next] | [standalone]

#3355

Thanks John and 7stud - I have a better understanding now.

-- 
Posted via http://www.ruby-forum.com/.

[toc] | [prev] | [standalone]

Back to top | Article view | comp.lang.ruby

csiph-web