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?

ie can seem a bit vague. en.wikipedia.org/wiki/Ie

Benoît
– Benoît

2013-05-23 04:42:43 +00:00
Commented May 23, 2013 at 4:42 — Benoît
– Benoît, Commented May 23, 2013 at 4:42

Dylan Markow · Accepted Answer · 2013-05-23 04:14:43Z

3

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

answered May 23, 2013 at 4:14

Dylan Markow

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1 Comment

mind.blank Over a year ago

You'd probably want to add downcase as well.

sawa · Accepted Answer · 2013-05-23 04:37:23Z

1

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

edited May 23, 2013 at 4:37

answered May 23, 2013 at 4:20

sawa

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1 Comment

Arup Rakshit Over a year ago

this will not work as per the OPs array phrase, need to have downcase method.

Arup Rakshit · Accepted Answer · 2013-05-23 04:27:48Z

0

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

browsers = ["chrome", "firefox", "ie", "opera"]
phrase.scan(/\w+/).select{|i| browsers.include? i.downcase }
#=> ["chrome", "firefox", "ie"]

edited May 23, 2013 at 4:27

answered May 23, 2013 at 4:21

Arup Rakshit

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