updated for version 7.4.685 Problem: When there are illegal utf-8 characters the old regexp engine may go past the end of a string. Solution: Only advance to the end of the string. (Dominique Pelle)

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