From: Brian Candler <b.candler@...>
Date: 2010-09-15T04:20:05+09:00
Subject: Re: beginner's q about eval and/or code blocks

Jeff Myers wrote:
> This ruby program successfully prints all 5-letter words starting with
> 'j'
> (in a text file containing all current U.S. English Scrabble words).
> 
> fp = File.open('C:\Documents and Settings\User\twl06FromMac.txt')
> fp.each  do |line|
>   puts line if line =~ /^j....$/
> end
> 
> I would like to allow the user to enter the regex rather than have it
> hard-coded as above. I've tried to get eval to work after building a
> string to pass it. No luck so far.

Try something like:

str = $stdin.gets.chomp
re = Regexp.new(str)
...
  puts line if line =~ re
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