Scieneer Common Lisp 1.3.9 online documentation

string-capitalize string &key start end[Function]

Given a string, returns a copy of the string with the first character of each ``word'' converted to upper-case, and remaining characters in the word converted to lower case. A ``word'' is defined to be a string of alphanumeric characters delimited by non-alphanumeric characters or the end of the string.