From: Robert Klemme <shortcutter@...>
Date: 2012-03-05T21:34:43+09:00
Subject: Re: Reading particular text from a txt file

Lekha Selvaraj wrote in post #1050186:
> I wrote the following code to read a particular line from a file :
>
> f = File.open('F:\Testing123.txt')
> a = f.readlines

You read more than necessary.  You just need to read 8 lines.

> puts a[7]

Btw, you are not closing the file properly.
http://blog.rubybestpractices.com/posts/rklemme/001-Using_blocks_for_Robustness.html

> The Output is :
> CRP+TYH+111111'
>
> What I want :
>
> I only want 111111 returned from the file.
> Can anyone pls tell me the code for that?

def r(f)
  File.open f do |io|
    io.each_with_index do |line, num|
      return line[/^CRP\+TYH\+(\d+)/, 1] if num == 7
    end
  end

  nil
end

or

def r(f)
  File.open f do |io|
    line = io.first(8)[-1] and line[/^CRP\+TYH\+(\d+)/, 1]
  end
end

Kind regards

robert

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