Ruby Retrieve a Set of String within a String

Question

I have the following issue.

phrase = "I love Chrome and firefox, but I don't like ie."

browsers = ["chrome", "firefox", "ie", "opera"]

def little_parser ( str )

  # what's the best way to retrieve all the browsers within phrase?

end

If we use the method little_parser( phrase ), it should return

["chrome", "firefox", "ie"]

If the phrase was:

 phrase_2 = "I don't use Opera"

If we run little_parser( phrase_2 ), it should return only:

["opera"]

How do I do that in the simplest way?

Answer 1

You could iterate through the browsers and use str.include? to single out the items which are in the string:

def little_parser(str)
  browsers = ["chrome", "firefox", "ie", "opera"]
  browsers.select { |browser| str.include?(browser) }
end

Answer 2

def little_parser(str)
  str.scan(/\w+/).map(&:downcase) & browsers
end