AAABBB@@xx@@(\d)\1\1(\d)\2\2@@xx@@1
AABB@@xx@@(.)\1(.)\2@@xx@@1
ABAB@@xx@@(.)(.)\1\2@@xx@@1
λһ@@xx@@([\d])\1{2,}@@xx@@1
ABABAB@@xx@@(\d)(\d)\1\2\1\2\1\2@@xx@@1
ABCABC@@xx@@(\d)(\d)(\d)\1\2\3@@xx@@1
