What are your Ruby Regex Idioms?

I use Rubular all the time for testing my regexes with ease. Give it a shot, its really well done:<p><a href="http://rubular.com/" rel="nofollow">http://rubular.com/</a>

This (ruby) regex thing still gives me a headache , esp when I'm trying to figure out other people's code

One of my favorite patterns:<p><pre><code> _, username, domain = */([^@]+)@(.+$)/.match("foo@example.com")</code></pre>

I didn't see it mentioned, but, btw, this code allows a method to introspect to figure out what the method name that's currently being executed.<p>caller[0][/`([^']*)'/, 1]<p>Note that you only need to do this for Ruby 1.8. In Ruby 1.9, there will be a __method__() and __callee__() method that does the same thing.

Woah.. I want that for Python..

<p><pre><code> (foo){2,5}</code></pre>