CLCS

Examples of Multiple Escape Characters

 ;; The following examples assume the readtable case of *readtable* 
 ;; and *print-case* are both :upcase.
 (eq 'abc 'ABC) ⇒  true
 (eq 'abc '|ABC|) ⇒  true
 (eq 'abc 'a|B|c) ⇒  true
 (eq 'abc '|abc|) ⇒  false