[Bug classpath/25817] New: gnu.regexp: character range and case insensitive matching

[kaz at maczuka dot gcd dot org]

CASE_INSENSITIVE flag does not work well in some case, where
the lower and higher bound of a character range is not alphabetic.

$ cat W.java
import java.util.regex.*;
public class W {
  public static void main(String[] args) throws Exception {
    int flags = 0;
    if (System.getProperty("CASE_INSENSITIVE") != null) {
      flags |= Pattern.CASE_INSENSITIVE;
    }
    Pattern p = Pattern.compile(args[1], flags);
    Matcher m = p.matcher(args[0]);
    System.out.println(m.matches());
  }
}

GNU Classpath:
$ java  W 'a' '[?-_]'
false
$ java -DCASE_INSENSITIVE=1 W 'a' '[?-_]'
false

This should be true because '?' <= 'A' <= '_'

Sun's JDK:
$ java  W 'a' '[?-_]'
false
$ java -DCASE_INSENSITIVE=1 W 'a' '[?-_]'
true

Perl:
$ perl -e 'print ("a" =~ /[?-_]/ ? "true\n" : "false\n")'
false
$ perl -e 'print ("a" =~ /[?-_]/i ? "true\n" : "false\n")'
true

Ruby:
$ ruby -e 'print ("a" =~ /[?-_]/ ? "true\n" : "false\n")'
false
$ ruby -e 'print ("a" =~ /[?-_]/i ? "true\n" : "false\n")'
true


-- 
           Summary: gnu.regexp: character range and case insensitive
                    matching
           Product: classpath
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: classpath
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kaz at maczuka dot gcd dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25817