PDGREPPE is Pattern Definition GREP with Pattern Editing. FGREPPE is Fast Fixed GREP with Pattern Editing. PDGREPPE searches by Extended Regular Expressions. It can reuse search patterns from definition files, employ (MarkedGroups) of pattern data that appear later in patterns. FGREPPE uses FIXED literal patterns. The many options include screen paging, line wrap, high light of match areas and descent into file system with multiple drives.