On Sat, Aug 21, 2010 at 7:11 PM, CuppoJava <patrickli_2...@hotmail.com> wrote:
> Hi Everyone,
>
> I'm extremely stuck on this simple regex question, which I'm sure
> someone with a little more experience will be able to write in a
> second. I would really appreciate the help.
>
> Given a string consisting of a's, b's, and spaces: "aaa bbb abb ab
> bb"
>
> I want to tokenize this into string's of a's and b's.
> eg. "aaa", "bbb", "a", "bb", "a", "b", "bb"
>
> AND also, I have to be able to tell which of the strings of b's was
> preceded with an "a", and which was preceded by a space.
(->> "aaa bbb abb ab bb"
(re-seq #"(?<=(.))?(\w)\2*")
(map (fn [[s pre]] {:s s, :pre pre})))
returns a lazy seq:
({:s "aaa", :pre nil}
{:s "bbb", :pre " "}
{:s "a", :pre " "}
{:s "bb", :pre "a"}
{:s "a", :pre " "}
{:s "b", :pre "a"}
{:s "bb", :pre " "})
--Chouser
http://joyofclojure.com/
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