replace

(replace sequence-1 sequence-2 &key start1 end1 start2 end2)

Copies the elements of sequence-2 (bounded by :start2/:end2) into sequence-1 (bounded by :start1/:end1) and returns the result. The number of elements copied is the smaller of the two bounded lengths. String sequences are supported (the case cl-who needs); because strings are immutable values, replace returns a fresh string rather than mutating sequence-1 in place. Available on all backends except --no-gc.