diff options
Diffstat (limited to 'usr.bin/sed')
| -rw-r--r-- | usr.bin/sed/sed.1 | 35 |
1 files changed, 16 insertions, 19 deletions
diff --git a/usr.bin/sed/sed.1 b/usr.bin/sed/sed.1 index 22b7df38eda..7aa4f21eb05 100644 --- a/usr.bin/sed/sed.1 +++ b/usr.bin/sed/sed.1 @@ -1,4 +1,4 @@ -.\" $OpenBSD: sed.1,v 1.54 2017/12/19 17:46:28 martijn Exp $ +.\" $OpenBSD: sed.1,v 1.55 2018/07/10 09:10:03 schwarze Exp $ .\" .\" Copyright (c) 1992, 1993 .\" The Regents of the University of California. All rights reserved. @@ -32,7 +32,7 @@ .\" .\" from: @(#)sed.1 8.2 (Berkeley) 12/30/93 .\" -.Dd $Mdocdate: December 19 2017 $ +.Dd $Mdocdate: July 10 2018 $ .Dt SED 1 .Os .Sh NAME @@ -155,9 +155,11 @@ An address is not required, but if specified must be a number (that counts input lines cumulatively across input files), a dollar character .Pq Ql $ -that addresses the last line of input, or a context address -(which consists of a regular expression preceded and followed by a -delimiter). +that addresses the last line of input, or a context address, +which is a regular expression preceded and followed by a delimiter. +The delimiter can be any character except a newline or a backslash. +Unless it is a slash, the opening delimiter needs to be escaped with +a backslash. .Pp A command line with no addresses selects every pattern space. .Pp @@ -196,20 +198,16 @@ has the following two additions to BREs: .Pp .Bl -enum -compact .It -In a context address, any character other than a backslash -.Pq Ql \e -or newline character may be used to delimit the regular expression. -The opening delimiter should be preceded by a backslash -unless it is a slash. -Putting a backslash character before the delimiting character -causes the character to be treated literally. -For example, in the context address \exabc\exdefx, the RE delimiter +The character delimiting the regular expression +can be used inside the regular expression by prepending a backslash +or by including it in a character class. +For example, in the context address \ex\ex[xy]x, the RE delimiter is an .Sq x -and the second +and the other .Sq x -stands for itself, so that the regular expression is -.Dq abcxdef . +characters stand for themselves, so that the regular expression is +.Dq x[xy] . .Pp .It The escape sequence \en matches a newline character embedded in the @@ -412,9 +410,8 @@ string for the first instance of the regular expression in the pattern space. Any character other than backslash or newline can be used instead of a slash to delimit the regular expression and the replacement. -Within the regular expression and the replacement, -the delimiter itself can be used as a literal character -if it is preceded by a backslash. +Also see the the section about +.Sx SED REGULAR EXPRESSIONS . .Pp An ampersand .Pq Ql & |