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| ANSI Common Lisp 17 Sequences 17.3 Dictionary of Sequences
17.3.17 mismatch | Function
  Syntax: mismatch sequence-1 sequence-2 `&key` from-end test test-not key start1 start2 end1 end2 position Arguments and Values: Sequence-1 - a sequence. Sequence-2 - a sequence. from-end - a generalized boolean. The default is false. test - a designator for a function of two arguments that returns a generalized boolean. test-not - a designator for a function of two arguments that returns a generalized boolean. start1, end1 - bounding index designators of sequence-1. The defaults for start1 and end1 are `0` and nil, respectively. start2, end2 - bounding index designators of sequence-2. The defaults for start2 and end2 are `0` and nil, respectively. key - a designator for a function of one argument, or nil. position - a bounding index of sequence-1, or nil. Description: The specified subsequences of sequence-1 and sequence-2 are compared element-wise. The key argument is used for both the sequence-1 and the sequence-2. If sequence-1 and sequence-2 are of equal length and match in every element, the result is false. Otherwise, the result is a non-negative integer, the index within sequence-1 of the leftmost or rightmost position, depending on from-end, at which the two subsequences fail to match. If one subsequence is shorter than and a matching prefix of the other, the result is the index relative to sequence-1 beyond the last position tested. If from-end is true, then one plus the index of the rightmost position in which the sequences differ is returned. In effect, the subsequences are aligned at their right-hand ends; then, the last elements are compared, the penultimate elements, and so on. The index returned is an index relative to sequence-1. Examples:
       (mismatch "abcd" "ABCDE" :test #'char-equal)  4
       (mismatch '(3 2 1 1 2 3) '(1 2 3) :from-end t)  3
       (mismatch '(1 2 3) '(2 3 4) :test-not #'eq :key #'oddp)   NIL
       (mismatch '(1 2 3 4 5 6) '(3 4 5 6 7) :start1 2 :end2 4)   NIL
See Also: Section 3.6 Traversal Rules and Side Effects Notes: The `:test-not` argument is deprecated. Allegro CL Implementation Details: None.

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