------- Comment #5 from kaz at maczuka dot gcd dot org 2006-02-08 11:13 -------
Before implementing this new syntax, could someone explain this
strange behavior of Sun's JDK? The source of W.java used here
is attached below.
bash$ java -DFIND=1 W 'b' '[^b]'
false
bash$ java -DFIND=1 W 'b' '[^b[b]]'
true
G0 = b
bash$ java -DFIND=1 W 'b' '[^b[b]b]'
false
bash$ java -DFIND=1 W 'b' '[^b[b]b[b]]'
true
G0 = b
bash$ java -DFIND=1 W 'b' '[^b[b]b[b]b]'
false
bash$ java -DFIND=1 W 'b' '[^[b]]'
true
G0 = b
bash$ java -DFIND=1 W 'b' '[^[b]b]'
false
bash$ java -DFIND=1 W 'b' '[^[b]b[b]]'
true
G0 = b
bash$ java -DFIND=1 W 'b' '[^[b]b[b]b]'
false
bash$ cat W.java
import java.util.regex.*;
public class W {
public static void main(String[] args) throws Exception {
int flags = 0;
boolean find = (System.getProperty("FIND") != null);
if (System.getProperty("CASE_INSENSITIVE") != null) {
flags |= Pattern.CASE_INSENSITIVE;
}
Pattern p = Pattern.compile(args[1], flags);
Matcher m = p.matcher(args[0]);
boolean b = (find ? m.find() : m.matches());
System.out.println(b);
if (b) {
int groups = m.groupCount();
for (int i = 0; i <= groups; i++) {
System.out.println("G" + i + " = " + m.group(i));
}
}
}
}
I assume
[^X[Y][Z]] means (not X) or Y or Z
whrere X must not contain a subclass enclosed by [].
[^[X]] and [^X[Y]Z] are invalid expressions whose matching results are
meaningless, although Sun's JDK neglects the checking of validity.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26166
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