ARB
     Returns a pattern that matches an arbitrary sequence of characters of
     the length you specify.  The characters themselves are arbitrary.
  Syntax
     pattern := ARB (integer)
  Parameters
     integer    The number of characters in the pattern, starting at the
                current character position.
  Example
     pat1 := ARB (5);
     Creates a pattern matching the next 5 characters starting at the
     current character position.