(m4.info) Translit

 
 Translating characters
 ======================
 
    Character translation is done with `translit':
 
      translit(STRING, CHARS, REPLACEMENT)
 
 which expands to STRING, with each character that occurs in CHARS
 translated into the character from REPLACEMENT with the same index.
 
    If REPLACEMENT is shorter than CHARS, the excess characters are
 deleted from the expansion.  If REPLACEMENT is omitted, all characters
 in STRING, that are present in CHARS are deleted from the expansion.
 
    Both CHARS and REPLACEMENT can contain character-ranges, e.g., `a-z'
 (meaning all lowercase letters) or `0-9' (meaning all digits).  To
 include a dash `-' in CHARS or REPLACEMENT, place it first or last.
 
    It is not an error for the last character in the range to be `larger'
 than the first.  In that case, the range runs backwards, i.e., `9-0'
 means the string `9876543210'.
 
      translit(`GNUs not Unix', `A-Z')
      =>s not nix
      translit(`GNUs not Unix', `a-z', `A-Z')
      =>GNUS NOT UNIX
      translit(`GNUs not Unix', `A-Z', `z-a')
      =>tmfs not fnix
 
    The first example deletes all uppercase letters, the second converts
 lowercase to uppercase, and the third `mirrors' all uppercase letters,
 while converting them to lowercase.  The two first cases are by far the
 most common.
 
    The builtin macro `translit' is recognized only when given arguments.
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