Hi Chris, just noticed this post. I wanted re-split to behave like
Perl/Ruby's split, although the dot-method syntax makes it redundant
with (.split string "regex").
String.split(...) takes a String argument as the regex, not a Pattern;
not sure if there's a performance penalty from recompiling the regex.
But sure, add yours in too. Maybe call it re-partition, since it's a
bit like Rich's partition-by (in clojure.contrib.seq-utils).
-Stuart
On Sep 8, 11:59 pm, Chouser <[EMAIL PROTECTED]> wrote:
> I'd written a re-split before discovering Stuart's in
> clojure.contrib.str-utils. Mine's a little different in that it's
> lazy and the seq it returns includes the parts that match the pattern
> as well as the parts in between:
>
> user=> (my-re-split #"[0-9]+" "abc123def456")
> ("abc" "123" "def" "456")
> user=> (re-split #"[0-9]+" "abc123def456")
> ("abc" "def")
>
> It's easy to use seq functions or destructuring to pick out the pieces you
> want:
>
> user=> (take-nth 2 (my-re-split #"[0-9]+" "abc123def456"))
> ("abc" "def")
>
> That's just like re-split from str-utils. Or you can get just the separators:
>
> user=> (take-nth 2 (rest (my-re-split #"[0-9]+" "abc123def456")))
> ("123" "456")
>
> Or both:
>
> user=> (for [[othr num] (partition 2 (my-re-split #"[0-9]+"
> "abc123def456"))] {:othr othr :num num})
> ({:num "123", :othr "abc"} {:num "456", :othr "def"})
>
> So, should I add my-re-split to str-utils? If so, is it similar
> enough to re-split to replace the existing one? Otherwise, what would
> be a good name for it?
>
> Here's the implementation:
>
> (defn re-split
> [#^java.util.regex.Pattern re #^CharSequence cs]
> (let [m (re-matcher re cs)]
> ((fn step [prevend]
> (if (.find m)
> (lazy-cons (.subSequence cs prevend (.start m))
> (lazy-cons (re-groups m)
> (step (+ (.start m) (count (.group m))))))
> (when (< prevend (.length cs))
> (list (.subSequence cs prevend (.length cs))))))
> 0)))
>
> --Chouser
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