On 12/06/10 05:11, Sylvain Le Gall wrote:
On 06-12-2010, David Allsopp dra-n...@metastack.com wrote:
zaid Khalid wrote:
Hint I am using (Str.regexp)
There are other libraries (e.g. pcre-ocaml) which provide different (I
would say more powerful, rather than strictly better!)
implementations.
There is also syntax extension like mikmatch, that helps to write regexp
in a very meaningful syntax:
match str with
| RE bol a* | ab* eol -
true
| _ -
false
If I understand correctly the original problem, the solution is:
match str with
| RE (a* | aba*) eos -
(* matches always the beginning of the string,
eos enforces a match at the end of the string,
and the vertical bar has the lowest priority
and so parentheses are needed. *)
true
| _ -
false
http://martin.jambon.free.fr/mikmatch-manual.html
http://martin.jambon.free.fr/mikmatch.html
You can use pcre and str with mikmatch.
I would recommend the pcre variant mostly for one feature that is not
provided by str: lazy quantifiers, i.e. repeat as little as possible
before trying to match what comes next.
Martin
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