From: Michal Zacik <michal.zacik@...>
Date: 2009-08-28T17:27:21+09:00
Subject: Re: I need a string#all_indices method--is there such a thing?

scan

timr wrote:
> 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]
>
>
>