BM关键字查找算法，在用于查找子字符串的算法当中，BM（Boyer-Moore）算法是目前相当有效又容易理解的一种，一般情况下，比KMP算法快3-5倍。,BM keyword search algorithm used in the sub-string search algorithm which, BM (Boyer-Moore) algorithm is quite effective and easy to understand A, under normal circumstances, more than 3-5 times the KMP algorithm quickly.