Scieneer Common Lisp 1.3.9 online documentation

search sequence1 sequence2 &key from-end test test-not start1 end1 start2 end2 key[Function]

A search is conducted using eql for the first subsequence of sequence2 which element-wise matches sequence1. If there is such a subsequence in sequence2, the index of the its leftmost element is returned; otherwise () is returned.