FULL PRODUCT VERSION :
Java 1.6.x-y

ADDITIONAL OS VERSION INFORMATION :
Documentation issue, all OS

A DESCRIPTION OF THE PROBLEM :
This issue has already been addressed by bug 6371680 which has been closed with fixing.
The API documentation for the class java.util.regex.Pattern states that "Groups beginning with (? are pure, non-capturing groups" which is definitively false and must be replaced by "(?:"
The wrong description is still present for example in <http://download.oracle.com/javase/tutorial/essential/regex/groups.html> or the Javadoc page of java.util.regexp.Pattern


REPRODUCIBILITY :
This bug can be reproduced always.