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, Start to interpret new symbol or sequence Use the Separation operator "," to segregate items in a pattern. For example : to separate an escaped number from a string "\0,09" makes a pattern that will match data with byte 0 being ZERO followed by the character '0' followed by the character '9'. For example : to separate a repeat string from a group "x*,{22}" makes pattern "x*" followed by group "{22}". pdgreppe -Hjc "\0h30" file_id.diz ..."\0h30" finds the character '0' (Hex 30) in file_id.diz. pdgreppe -Hjc "\0h30,1" file_id.diz ...separation operator "," in pattern "\0h30,1" helps find the character '0' (Hex 30) followed by the character '1' in file_id.diz. pdgreppe -Hjc "\0h301" file_id.diz ...a pattern of "\0h301" does not work. A character of numerical value 301 does not fit in a character table having a maximum of 255 characters. A pattern or sub-pattern that ONLY consists of one or more separations "," is an empty pattern and matches EVERY data point for zero width. Finally, the "," feature can add readability to a pattern: (x),tv,#0 might be easier to see as 3 parts than (x)tv#0
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