Match against 'abbbbbbc' 01234567 1) ok! pos = 0. (zw) 2) ok! Found an 'a' at pos 0. pos = 1. 3) ok! Found 6 'b's at pos 1 through 6. pos = 7. 4) fail! Did not find a 'b' at pos 7. Backtrack! 3) ok! Found 5 'b's at pos 1 through 5. pos = 6. 4) ok! Found a 'b' at pos 6. pos = 7. 5) ok! Found a 'c' at pos 7. pos = 8. Match!