Here’s a handy Ruby script I wrote a few months ago to extract email addresses from a blob of text.

In this case, all of the email addresses are surrounded by angle-brackets, so that makes the script much easier.

It’s kind of trivial, but a nice little example of the elegance of Ruby:
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#!/usr/bin/ruby -w

IO.foreach("data.txt") {|line|
    line.scan(/<.*?@.*?>/).each{|addr|puts(addr.delete('<>') + "\n")}
}