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Diffstat (limited to 'doc/regexp.n')
| -rw-r--r-- | doc/regexp.n | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/doc/regexp.n b/doc/regexp.n index ad3a46f..2c18183 100644 --- a/doc/regexp.n +++ b/doc/regexp.n @@ -4,7 +4,7 @@ '\" 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 1.28 2007/12/13 15:22:33 dgp Exp $ +'\" RCS: @(#) $Id: regexp.n,v 1.28.2.1 2008/07/07 08:36:30 dkf Exp $ '\" .so man.macros .TH regexp n 8.3 Tcl "Tcl Built-In Commands" @@ -149,39 +149,45 @@ portion of the expression that was not matched), then the corresponding .QW "\fB\-1 \-1\fR" if \fB\-indices\fR has been specified or to an empty string otherwise. .SH EXAMPLES +.PP 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), .VS 8.5 string(n) .VE - - .SH KEYWORDS -match, regular expression, string +match, parsing, pattern, regular expression, splitting, string |