From: timr <timrandg@...>
Date: 2009-08-28T17:25:08+09:00
Subject: I need a string#all_indices method--is there such a thing?

In ruby you can use string#index as follows:
str = "some text"
str.index(/t/)
=>5

But what if I want to get all the indices for a regex in the string?
Is there an string#all_indices method?

I wrote the following, which works, but there must be a more elegant
way:

class String
  def all_indices(regex)
  indices = []
  index = 0
    while index && index < self.length #index will be nil upon first
match failure, otherwise quit loop when index is equal to string
length
      index = self.index(regex, index)
      if index.is_a? Numeric   #avoids getting a nil into the indices
array
        indices << index
        index +=1
      end
    end
    indices
  end
end
p "this is a test string for the ts in the worldt".all_indices(/t/)
p "what is up with all the twitter hype".all_indices(/w/)
# >> [0, 10, 13, 16, 26, 30, 36, 45]
# >> [0, 11, 25]