Comment 1 for bug 1070533

This is a bug in ICU. For example, this function hangs for the same reason:

    bool f() {
      UnicodeString p( "(2*){2,}?a2\\z" );
      UErrorCode status = U_ZERO_ERROR;
      RegexMatcher m( p, 0, status );
      assert( U_SUCCESS( status ) );

      UnicodeString s( "2a3" );
      m.reset( s );
      return m.find() != 0;
    }