Implementation of:
Alfred V. Aho and Margaret J. Corasick. 1975. Efficient string matching: an aid to bibliographic search. Commun. ACM 18, 6 (June 1975), 333-340. DOI=http://dx.doi.org/10.1145/360825.360855
J. I. Aoe. 1989. An efficient implemenatation of string pattern matching machines for a finite number of keywords. SIGIR Forum 23, 3-4 (April 1989), 22-33. DOI=http://dx.doi.org/10.1145/74697.74699