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.\" $OpenBSD: A1.in,v 1.1 2022/06/08 13:08:00 schwarze Exp $
.Dd $Mdocdate$
.Dt ESC-A1 1
.Os
.Sh NAME
.Nm esc-A1
.Nd the roff escape A sequence: identifier syntax validation
.Sh DESCRIPTION
empty: \A''
.br
letters: \A'word'
.br
blank: \A'two words'
.br
ASCII non-letters: \AA!"#$%&'()*+,-./0123456789:;<=>?@[\\]^_`{|}~A
.br
invalid escapes: \A'\\\.\G'
.Ss Argument delimiters
unsupported \er: \A\rword\ru
.br
ignored \e&: \A\&word\&u
.br
useless \e.: \A\.word.u
.br
invalid \eG: \A\GwordGu
.br
special \e-: \A\-word\-u
.br
break \ep: \A\pword\pu
.br
nospace \ec: \A\cword\cu
.\".br
.\"skipchar \ez: \A\zword\zu
.br
.ds mystr xwordxu
string expansion: \A\*[mystr]
.br
.nr myreg 121
register expansion: \A\n[myreg]u
.br
ignored \eON: \A\O1word\O2u
.br
special character: \A\(hyword\(hyu
.br
ignored \eZ\(aqstr\(aq: \A\Z'foo'word\Z'bar'u
.br
horizontal motion: \A\h'1'word\h'3'u
.br
horizontal line: \A\l'4'word\l'2'u
.br
overstrike: \A\o'ab'word\o'cd'u
.br
unterminated: \A'word
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