FULL PRODUCT VERSION :
1.8.0_144

A DESCRIPTION OF THE PROBLEM :
When matching against a regular expression that has nested capturing groups inside a greedy repetition, the nested capturing groups aren't correctly backtracked..

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1) compile the pattern "([a-z]([a-z]))+[a-z][a-z]"
2) match against the input "abcdef"
3) check the value of group 2

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Group 2 should have the value "d"
ACTUAL -
Actually, Group 2 has the value "f"

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Pattern p = Pattern.compile("([a-z]([a-z]))+[a-z][a-z]");
Matcher m = p.matcher("abcdef");
if(m.matches() ){
    System.out.println("Group 2 is " + m.group(2) );
}
---------- END SOURCE ----------