Re: Patch to display "System" colors

[Richard Stallman]

    +(defun facemenu-string-match-and-replace (str from to)
    +  "Return the string STR with all occurences of the regular
    +expression FROM replaced by TO."

This doc string doesn't follow the conventions -- please
see the Tips appendix in the Emacs Lisp manual.

However, you don't need the function, since you can use
replace-regexp-in-string.