* [Caml-list] Str broken
@ 2004-09-14 9:26 skaller
2004-09-14 9:35 ` micha-1
2004-09-14 9:42 ` Erik de Castro Lopo
0 siblings, 2 replies; 5+ messages in thread
From: skaller @ 2004-09-14 9:26 UTC (permalink / raw)
To: caml-list
The Str module seems not to work:
open Str;;
let re = "(a\\|b)*abb"
let cre = regexp re
let s = "ababababb"
;;
string_match cre s 0
;;
returns false. This is the classic test from the Dragon book.
Before I post a bug report can someone confirm this result please?
I'm using: Objective Caml version 3.09+dev0 (2004-07-13)
--
John Skaller, mailto:skaller@users.sf.net
voice: 061-2-9660-0850,
snail: PO BOX 401 Glebe NSW 2037 Australia
Checkout the Felix programming language http://felix.sf.net
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Caml-list] Str broken
2004-09-14 9:26 [Caml-list] Str broken skaller
@ 2004-09-14 9:35 ` micha-1
2004-09-14 13:05 ` skaller
2004-09-14 9:42 ` Erik de Castro Lopo
1 sibling, 1 reply; 5+ messages in thread
From: micha-1 @ 2004-09-14 9:35 UTC (permalink / raw)
To: caml-list
On Tuesday 14 September 2004 11:26, skaller wrote:
> The Str module seems not to work:
>
> open Str;;
> let re = "(a\\|b)*abb"
it works with:
let re = "\\(a\\|b\\)*abb"
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Caml-list] Str broken
2004-09-14 9:26 [Caml-list] Str broken skaller
2004-09-14 9:35 ` micha-1
@ 2004-09-14 9:42 ` Erik de Castro Lopo
2004-09-14 10:06 ` Keith Wansbrough
1 sibling, 1 reply; 5+ messages in thread
From: Erik de Castro Lopo @ 2004-09-14 9:42 UTC (permalink / raw)
To: caml-list
On 14 Sep 2004 19:26:59 +1000
skaller <skaller@users.sourceforge.net> wrote:
> The Str module seems not to work:
>
> open Str;;
> let re = "(a\\|b)*abb"
> let cre = regexp re
> let s = "ababababb"
> ;;
> string_match cre s 0
> ;;
>
> returns false. This is the classic test from the Dragon book.
> Before I post a bug report can someone confirm this result please?
> I'm using: Objective Caml version 3.09+dev0 (2004-07-13)
I'm using 3.07+2 here. The code you posted produced a warning for
me. It seems that for ocaml some extra escaping is required in
comparison with other languages.
Fixing this code:
open Str ;;
let re = "\\(a\\|b\\)*abb" ;;
let cre = regexp re ;;
let s = "ababababb" ;;
if string_match cre s 0 then print_endline "true"
else print_endline "false" ;;
prints "true" for me.
Cheers,
Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo nospam@mega-nerd.com (Yes it's valid)
+-----------------------------------------------------------+
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it."
--Brian Kernighan
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^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [Caml-list] Str broken
2004-09-14 9:42 ` Erik de Castro Lopo
@ 2004-09-14 10:06 ` Keith Wansbrough
0 siblings, 0 replies; 5+ messages in thread
From: Keith Wansbrough @ 2004-09-14 10:06 UTC (permalink / raw)
To: Erik de Castro Lopo; +Cc: caml-list
Erik wrote:
> On 14 Sep 2004 19:26:59 +1000
> skaller <skaller@users.sourceforge.net> wrote:
>
> > The Str module seems not to work:
[..]
> > let re = "(a\\|b)*abb"
[..]
> I'm using 3.07+2 here. The code you posted produced a warning for
> me. It seems that for ocaml some extra escaping is required in
> comparison with other languages.
The documentation says "The syntax for regular expressions is the same
as in Gnu Emacs." (sec 22.1).
My emacs documentation (v21.2.1) says about regexps:
> The special characters are `$', `^', `.', `*', `+', `?',
> `[', `]' and `\'. Any other character appearing in a regular
> expression is ordinary, unless a `\' precedes it.
This is similar to GNU grep (basic) regular expressions, except for
the inclusion of '?', and the exclusion of character classes.
It's not clear from the documentation whether the other Emacs
constructs not listed in the OCaml manual entry are supported,
e.g. \(?: ... \), \`, \B, \<, etc.
--KW 8-)
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2004-09-14 9:26 [Caml-list] Str broken skaller
2004-09-14 9:35 ` micha-1
2004-09-14 13:05 ` skaller
2004-09-14 9:42 ` Erik de Castro Lopo
2004-09-14 10:06 ` Keith Wansbrough
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