How to extract groups from a regex match in Ruby without globals or temporary variables. Code snippets supporting http://blog.samstokes.co.uk/post/251167556/regex-style-in-ruby

regex-groups-global.rb

if "foo@example.com" =~ /@(.*)/
  $1
else
  raise "bad email"
end
# => "example.com"

regex-groups-matchobject.rb

match = /@(.*)/.match("foo@example.com")
if match
  match[1]
else
  raise "bad email"
end
# => "example.com"

regex-groups-moreoneliners.rb

$1 if "foo@example.com" =~ /@(.*)/ or raise "bad email"  # => "example.com"

require 'andand'
/@(.*)/.match("foo@example.com").andand[1]               # => "example.com"

regex-groups-subscript.rb

"foo@example.com"[/@(.*)/, 1] or raise "bad email"
# => "example.com"

I found that match = /@(.*)/.match("foo@example.com") gave different results than "foo@example.com" =~ /@(.*)/.

Same Regex and same body but result was different so ended up using =~.

I take it back. I might not have been using .captures after using .match(). It works great, actually.