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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.

.\" $OpenBSD: delim.in,v 1.1 2022/06/08 13:08:00 schwarze Exp $
.Dd $Mdocdate: June 8 2022 $
.Dt N-DELIM 1
.Os
.Sh NAME
.Nm N-delim
.Nd argument delimiters for the N escape sequence
.Sh DESCRIPTION
unsupported \e!: \N\!42\!u
.br
unsupported \er: \N\r42u
.br
ignored \e%: \N\%42\%u
.br
ignored \e&: \N\&42\&u
.br
ignored \e): \N\)42\)u
.br
ignored \e,: \N\,42\,u
.br
ignored \e/: \N\/42\/u
.br
ignored \e^: \N\^42\^u
.br
ignored \ea: \N\a42\au
.br
ignored \ed: \N\d42\du
.br
ignored \et: \N\t42\tu
.br
ignored \eu: \N\u42\uu
.br
ignored \e{: \N\{42\{u
.br
ignored \e|: \N\|42\|u
.br
ignored \e}: \N\}42\}u
.br
useless \e.: \N\.42.u
.\".br
.\"XXX useless \e\e: \N\\42\\u
.br
invalid \eG: \N\G42Gu
.br
special \e\ : \N\ 42\ u
.br
special \e\(aq: \N\'42\'u
.br
special \e-: \N\-42\-u
.br
special \e0: \N\042\0u
.br
special \e:: \N\:42\:u
.br
special \e_: \N\_42\_u
.br
special \e\(ga: \N\`42\`u
.br
special \ee: \N\e42\eu
.br
special \e~: \N\~42\~u
.br
break \ep: \N\p42\pu
.br
nospace \ec: \N\c42\cu
.\".br
.\"XXX skipchar \ez: \N\z42\zu
.br
.ds mystr x42xu
string expansion: \N\*[mystr]
.br
.nr myreg 23
register expansion: \N\n[myreg]u
.br
ignored \eO: \N\O142\O2u
.br
ignored \eY: \N\Y[mystr]42\Y[mystr]u
.br
ignored \ek: \N\k[myreg]42\k[myreg]u
.br
special character: \N\(hy42\(hyu
.br
ignored \eD: \N\D't 1'42\D't 2'u
.br
ignored \eL: \N\L'2'42u
.br
ignored \eX: \N\X'foo'42\X'bar'u
.br
ignored \eZ: \N\Z'foo'42\Z''u
.br
ignored \eb: \N\b'2'42\b''u
.br
ignored \ev: \N\v'2'42\v'0'u
.br
ignored \ex: \N\x'2'42\v'0'u
.br
horizontal motion: \N\h'1'42\h'3'u
.br
horizontal line: \N\l'4'42\l'2'u
.br
overstrike: \N\o'ab'42\o'cd'u