Why does `Pattern.compile("(?:\u00e9)",Pattern.CANON_EQ)` throw?

Question

There's no limitation on the regular expression compiled with the Pattern.CANON_EQ. However

Pattern.compile("(?:\u00e9)",Pattern.CANON_EQ);

throws an exception:

java.util.regex.PatternSyntaxException: Unmatched closing ')' near index 11
((?:é)|é)|e)́)
       ^

Note that the pattern is the normalized string. It looks like a bug in JRE, but I can't find such a bug in the issue tracker.

Answer 1

Seems it's this: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4867170