How to search through array with Regex?

Question

So I am trying to match email to email domains (ie bob@test to @test.com). Both the array of emails and email domains are in separate arrays. Right now I am trying the following

Answer 1

@domains = ["hotmail.com", "gmail.com"]
@emails = ["blah@hotmail.com", "you@yahoo.com", "me@gmail.com"]
@a = []

@domains.each {|d|
  @a << @emails.select{ |e| e=~ /#{d}/ }
}

@a.flatten! #=> ["blah@hotmail.com", "me@gmail.com"]

Now I can do stuff with @a