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

regex-groups-matchobject.rb

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

regex-groups-moreoneliners.rb

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

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

regex-groups-subscript.rb

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

I found that match = /@(.*)/.match("[email protected]") gave different results than "[email protected]" =~ /@(.*)/.

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.