vim-patch:7.4.289  #752

Problem:    Pattern with repeated backreference does not match with new regexp
            engine. (Urtica Dioica)
Solution:   Also check the end of a submatch when deciding to put a state in
            the state list.

https://code.google.com/p/vim/source/detail?r=99374096a76b96d1128f5e6aa1fa92b4ba70fee9