Cs169x

"string", %Q{string}, 'string', %q{string} a=41 ; "The answer is #{a+1}"

• match a string against a regexp:

"fox@berkeley.EDU" =~ /(.*)@(.*)\.edu$/i /(.*)@(.*)\.edu$/i =~ "fox@berkeley.EDU"

• If no match, value is false
• If match, value is non-false, and $1...$n capture

parenthesized groups ($1 == 'fox', $2 == 'berkeley') /(.*)$/i or %r{(.*)$}i or Regexp.new('(.*)$', Regexp::IGNORECASE)

• a.b means: call method b on object a

• hashes

h = {"stupid" => 1, :example=> "foo" } h.has_key?("stupid") # => true h["not a key"] # => nil h.delete(:example) # => "foo"