From: Michael Tomer <michael.tomer@...>
Date: 2008-11-21T01:47:29+09:00
Subject: Re: Finding and writing to specified area in a text file

A gsub (global substitution) should take care of the problem. Here's an 
example of how I might do this:

######################################################

data = ""

File.open("my_file.txt", "r") do |file|
  data = file.read.gsub("INSERT", "new word")
end

File.open("my_file.txt", "w") do |file|
  data = file.write(data)
end

######################################################

The gsub command also supports regular expressions, if you need it.
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