Locate a string in an array of strings

Question

I would like to find the location in an array of all strings of any given word.

 phrase = "I am happy to see you happy."
 t = phrase.split
 location = t.index("happy") # => 2 (returns only first happy)




  t.map { |x| x.index("happy") } # => returns  [nil, nil, 0, nil, nil, nil, 0]

Sergio Tulentsev · Accepted Answer · 2012-06-01 21:13:05Z

2

Here's a way

phrase = "I am happy to see you happy."
t = phrase.split(/[\s\.]/) # split on dot as well, so that we get "happy", not "happy."

happies = t.map.with_index{|s, i| i if s == 'happy'} # => [nil, nil, 2, nil, nil, nil, 6]
happies.compact # => [2, 6]

answered Jun 1, 2012 at 21:13

Sergio Tulentsev

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4 Comments

chief Over a year ago

Thanks for the answer. The regex is not needed since split removes the period on its own.

Sergio Tulentsev Over a year ago

No, it doesn't.. And I'd be very surprised if it did.

fl00r Over a year ago

t = phrase.scan(/[[:word:]]+/)

Sergio Tulentsev Over a year ago

Hm, I thought, it could match whole words. For letters we have :alpha: :)

megas · Accepted Answer · 2012-06-01 21:20:00Z

1

phrase = "I am happy to see you happy."    
phrase.split(/[\W]+/).each_with_index.each_with_object([]) do |obj,res|
  res << obj.last if obj.first == "happy"
end
#=> [2, 6]

answered Jun 1, 2012 at 21:20

megas

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