One of my favorite Ruby methods is
String# when given a regular expression:
"fooobar"[/o+/] # => "ooo"
"fooobar"[/o+(.)/, 1] # => "b"
The first form returns the matched part of the string. The second form returns capture group number 1.
For one thing, it's short and sweet.
For another, it's robust.
"fooobar".match(/x(.)/) will raise "undefined method `' for nil:NilClass".
"fooobar"[/x(.)/, 1] will just return
It's a great choice for extracting a regexp match from a string.