[Caml-list] Pcre Confusion.

[Caml-list] Pcre Confusion.

[Ceri Storey]

Hi. I don't understand how pcre_full split is supposed to return Group
results:

# let rex = regexp "([A-Z][a-z]*)|([0-9]+)";;
val rex : Pcre.regexp = <abstr>
# Pcre.full_split ~rex:rex "Foo bar 42";;
- : Pcre.split_result list =
[Delim "Foo"; Group (1, "Foo"); NoGroup; Text " bar "; Delim "42"]

I don't see why there's no Group for the last Delim. If someone could
enlighten me, I'd be most grateful :)
-- 
Ceri Storey <cez@compsoc.man.ac.uk>
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Re: [Caml-list] Pcre Confusion.

[Markus Mottl]

On Sun, 24 Nov 2002, Ceri Storey wrote:
> Hi. I don't understand how pcre_full split is supposed to return Group
> results:
> 
> # let rex = regexp "([A-Z][a-z]*)|([0-9]+)";;
> val rex : Pcre.regexp = <abstr>
> # Pcre.full_split ~rex:rex "Foo bar 42";;
> - : Pcre.split_result list =
> [Delim "Foo"; Group (1, "Foo"); NoGroup; Text " bar "; Delim "42"]
> 
> I don't see why there's no Group for the last Delim. If someone could
> enlighten me, I'd be most grateful :)

Simple reason: it's a bug :-)

The true result is:

  [Pcre.Delim "Foo"; Pcre.Group (1, "Foo"); Pcre.NoGroup; Pcre.Text " bar ";
   Pcre.Delim "42"; Pcre.NoGroup; Pcre.Group (2, "42")]

I have patched PCRE-OCaml so if you want to fix this, please upgrade!

Regards,
Markus Mottl

-- 
Markus Mottl                                             markus@oefai.at
Austrian Research Institute
for Artificial Intelligence                  http://www.oefai.at/~markus
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