From: Johnathan Wagner <majorlag@...>
Date: 2007-04-01T09:43:01+09:00
Subject: Parsing an text file

Hi,
I cannot find a way to easily parse a text file. I am just starting to
learn ruby so please bear with me.

My text file looks like this:

0 8 2 9 3 0 0 4
9 2 8 3 9 3 0 2
2 3 4 9 8 8 9 0

Basically just numbers and spaces.

So far, I know how to read the file and put each line into an array.

def readfile(file)
  arr = IO.readlines(file)
  parsing(arr)
end

def parsing(arr)
  string1 = arr[0].to_s
  string2 = arr[1].to_s
  string3 = arr[2].to_s
  ans.each_byte {|b|p b.chr}
end

What I wanted to do is, for example, want to find all 8's and change it
to 5's.
I am stuck on how I can use the string and search each char's to find
the 8's and then change it. Also I would like to know if there is a for
loop or something to go through each array and store it into a new
string because there might be more than 3 lines. I have search through
documentations and trying to find examples but there doesn't seem to be
much help.

Any help, especially examples, would be appreciate. Thanks in advance.

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