lispdoc - results for string/=

(string/= string1 string2 &key (start1 0) end1 (start2 0) end2)
Function: Given two strings, if the first string is not lexicographically equal to the second string, returns the longest common prefix (using char=) of the two strings. Otherwise, returns ().
 Mentioned in:
CLtL2 - 18.2. String Comparison
PCL - string comparisons
Successful Lisp - chapter17