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Surprisingly, every escape sequence can also be used as an argument
delimiter for an outer escape sequence, in which case the delimiting
escape sequence retains its syntax but usually ignores its argument
and loses its inherent effect.  Add rudimentary support for this
syntax quirk in order to improve parsing compatibility with groff.

N-DELIM(1)                  General Commands Manual                 N-DELIM(1)

NNAAMMEE
     NN--ddeelliimm - argument delimiters for the N escape sequence

DDEESSCCRRIIPPTTIIOONN
     unsupported \!: *u
     unsupported \r: 42u
     ignored \%: *u
     ignored \&: *u
     ignored \): *u
     ignored \,: 42u
     ignored \/: *u
     ignored \^: 42u
     ignored \a: 42u
     ignored \d: 42u
     ignored \t: 42u
     ignored \u: 42u
     ignored \{: *u
     ignored \|: 42u
     ignored \}: *u
     useless \.: 42.u
     invalid \G: *u
     special \ : 42 u
     special \': *u
     special \-: *u
     special \0: 42 u
     special \:: *u
     special \_: *u
     special \`: *u
     special \e: *u
     special \~: 42 u
     break \p: *u
     nospace \c: *u
     string expansion: *u
     register expansion: 3u
     ignored \O: 42u
     ignored \Y: 42u
     ignored \k: *u
     special character: *u
     ignored \D: 42u
     ignored \L: 42u
     ignored \X: 42u
     ignored \Z: 42u
     ignored \b: 42u
     ignored \v: 42u
     ignored \x: 42u
     horizontal motion: 42   u
     horizontal line: 42__u
     overstrike: 42cdu

OpenBSD                          June 8, 2022                          OpenBSD