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wiz 2003-12-21 11:18:25 +00:00
parent 4eb81d63b4
commit 00c8cf496c
1 changed files with 6 additions and 6 deletions
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bin/expr/expr.1
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@ -1,4 +1,4 @@
.\" $NetBSD: expr.1,v 1.24 2003/12/21 10:02:46 jdolecek Exp $
.\" $NetBSD: expr.1,v 1.25 2003/12/21 11:18:25 wiz Exp $
.\"
.\" Copyright (c) 2000,2003 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -173,16 +173,16 @@ by
.An Jaromir Dolecek
.Aq jdolecek@NetBSD.org .
.Sh NOTES
Empty string
The empty string
.Dq
cannot be matched with intuitive:
cannot be matched with the intuitive:
.Bd -literal -offset indent
expr '' : '$'
.Ed
.Pp
The reason is the returned number of matched characters (zero)
is indistinguishable from failed match, so this returns failure.
To match empty string, use something like:
The reason is that the returned number of matched characters (zero)
is indistinguishable from a failed match, so this returns failure.
To match the empty string, use something like:
.Bd -literal -offset indent
expr x'' : 'x$'
.Ed