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-rw-r--r--doc/regexp.n28
1 files changed, 18 insertions, 10 deletions
diff --git a/doc/regexp.n b/doc/regexp.n
index 1e31131..e40b9c4 100644
--- a/doc/regexp.n
+++ b/doc/regexp.n
@@ -1,10 +1,11 @@
+'\" -*- nroff -*-
'\"
'\" Copyright (c) 1998 Sun Microsystems, Inc.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
-'\" RCS: @(#) $Id: regexp.n,v 1.29 2008/06/29 22:28:24 dkf Exp $
+'\" RCS: @(#) $Id: regexp.n,v 1.30 2008/07/07 08:29:14 dkf Exp $
'\"
.so man.macros
.TH regexp n 8.3 Tcl "Tcl Built-In Commands"
@@ -161,30 +162,37 @@ Find the first occurrence of a word starting with \fBfoo\fR in a
string that is not actually an instance of \fBfoobar\fR, and get the
letters following it up to the end of the word into a variable:
.CS
-\fBregexp\fR {\e<foo(?!bar\e>)(\ew*)} $string \-> restOfWord
+\fBregexp\fR {\emfoo(?!bar\eM)(\ew*)} $string \-> restOfWord
.CE
Note that the whole matched substring has been placed in the variable
-\fB\->\fR which is a name chosen to look nice given that we are not
+.QW \fB\->\fR ,
+which is a name chosen to look nice given that we are not
actually interested in its contents.
.PP
Find the index of the word \fBbadger\fR (in any case) within a string
and store that in the variable \fBlocation\fR:
.CS
-\fBregexp\fR \-indices {(?i)\e<badger\e>} $string location
+\fBregexp\fR \-indices {(?i)\embadger\eM} $string location
+.CE
+This could also be written as a \fIbasic\fR regular expression (as opposed
+to using the default syntax of \fIadvanced\fR regular expressions) match by
+prefixing the expression with a suitable flag:
+.CS
+\fBregexp\fR \-indices {(?ib)\e<badger\e>} $string location
.CE
.PP
-Count the number of octal digits in a string:
+This counts the number of octal digits in a string:
.CS
\fBregexp\fR \-all {[0\-7]} $string
.CE
.PP
-List all words (consisting of all sequences of non-whitespace
-characters) in a string:
+This lists all words (consisting of all sequences of non-whitespace
+characters) in a string, and is useful as a more powerful version of the
+\fBsplit\fR command:
.CS
\fBregexp\fR \-all \-inline {\eS+} $string
.CE
.SH "SEE ALSO"
-re_syntax(n), regsub(n),
-string(n)
+re_syntax(n), regsub(n), string(n)
.SH KEYWORDS
-match, regular expression, string
+match, parsing, pattern, regular expression, splitting, string