I think Balakrishnan Prasath wrote:
> hello all,
>
> Is it possible to do a wild card search in Jess. If so how..
I had to think a bit to figure out what you meant. I'm guessing you
want to rewrite the query below so that "?word" can be something like
"th*" to match all the words that start with "th".
Jess 6 doesn't have any kind of regular expression matching built in,
although Jess 7 will. For the time being, you could write a
Userfunction which used the java.lang.regexp package to do regular
expression matching, and then use it in your query.
Here's a simple version of such a Userfunction (requires JDK 1.4:)
class RegexpMatch implements Userfunction {
private static HashMap s_patterns = new HashMap();
public String getName() {
return "regexp";
}
public Value call(ValueVector vv, Context context) throws JessException {
String expression = vv.get(1).stringValue(context);
String trial = vv.get(2).stringValue(context);
Pattern regex = getPattern(expression);
boolean match = regex.matcher(trial).matches();
return match ? Funcall.TRUE : Funcall.FALSE;
}
private Pattern getPattern(String expression) {
Pattern p = (Pattern) s_patterns.get(expression);
if (p == null)
p = Pattern.compile(expression);
return p;
}
}
It could be used like this:
(defquery q_wn_hyp
(declare (variables ?expr))
(wn_sense (syn_id ?hypid) (word ?o&:(regexp ?expr ?o)))
(wn_hyp (hypo_id ?hypid) (hyper_id ?hyperid))
)
This would let you use Java's full regexp language for matching.
---------------------------------------------------------
Ernest Friedman-Hill
Science and Engineering PSEs Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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