The following example assumes that the disks are named
  UDISK{n} where {n} is a number, for example UDISK1,
  UDISK13. This filter replaces such disk names with the
  string "DISK_NAME":

     global_replace ( 'UDISK' + number, 'DISK_NAME')

  The pattern to replace is built from a string literal
  ('UDISK'), the concatenation operator (+) and the
  pattern "number" included in the supplied definitions
  file. The pattern "number" matches a sequence of
  digits.

  The replacement string is the string literal 'DISK_
  NAME'.