updated for version 7.4.028 Problem: Equivalence classes are not working for multi-byte characters. Solution: Copy the rules from the old to the new regexp engine. Add a test to check both engines.

1 a aa abb abbcc
2 d dd dee deeff
3 g gg ghh ghhii
4 j jj jkk jkkll
5 m mm mnn mnnoo
6 x aa$ x
7 (a)(b) abba
8 axx ab]xx
9 foobar
9 foo