%A byte range in hex of match
%l last line number of match
%L number of lines of a match
%R newline, if --break
%[hhhh]U U+hhhh Unicode code point
%y matching pattern as hex
%Y matching line as hex
%[ms]=...%= color of ms ... color off
%[n]j nth capture as JSON
%[n]q nth capture quoted
%[n]x nth capture as XML
%[n]y nth capture as hex
%[n]v nth capture as CSV
%[name]j named capture as JSON
%[name]q named capture quoted
%[name]x named capture as XML
%[name]y named capture as hex
%[name]v named capture as CSV
%[n|...]j capture n,... as JSON
%[n|...]q capture n,... quoted
%[n|...]x capture n,... as XML
%[n|...]y capture n,... as hex
%[n|...]v capture n,... as CSV