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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 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: regsub.n,v 1.2 1998/09/14 18:39:54 stanton Exp $
-'\" 
-.so man.macros
-.TH regsub n 7.4 Tcl "Tcl Built-In Commands"
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-regsub \- Perform substitutions based on regular expression pattern matching
-.SH SYNOPSIS
-\fBregsub \fR?\fIswitches\fR? \fIexp string subSpec varName\fR
-.BE
-
-.SH DESCRIPTION
-.PP
-This command matches the regular expression \fIexp\fR against
-\fIstring\fR,
-and it copies \fIstring\fR to the variable whose name is
-given by \fIvarName\fR.
-If there is a match, then while copying \fIstring\fR to \fIvarName\fR
-the portion of \fIstring\fR that
-matched \fIexp\fR is replaced with \fIsubSpec\fR.
-If \fIsubSpec\fR contains a ``&'' or ``\e0'', then it is replaced
-in the substitution with the portion of \fIstring\fR that
-matched \fIexp\fR.
-If \fIsubSpec\fR contains a ``\e\fIn\fR'', where \fIn\fR is a digit
-between 1 and 9, then it is replaced in the substitution with
-the portion of \fIstring\fR that matched the \fIn\fR-th
-parenthesized subexpression of \fIexp\fR.
-Additional backslashes may be used in \fIsubSpec\fR to prevent special
-interpretation of ``&'' or ``\e0'' or ``\e\fIn\fR'' or
-backslash.
-The use of backslashes in \fIsubSpec\fR tends to interact badly
-with the Tcl parser's use of backslashes, so it's generally
-safest to enclose \fIsubSpec\fR in braces if it includes
-backslashes.
-.LP
-If the initial arguments to \fBregexp\fR start with \fB\-\fR then
-they are treated as switches.  The following switches are
-currently supported:
-.TP 10
-\fB\-all\fR
-All ranges in \fIstring\fR that match \fIexp\fR are found and
-substitution is performed for each of these ranges.
-Without this switch only the first
-matching range is found and substituted.
-If \fB\-all\fR is specified, then ``&'' and ``\e\fIn\fR''
-sequences are handled for each substitution using the information
-from the corresponding match.
-.TP 10
-\fB\-nocase\fR
-Upper-case characters in \fIstring\fR will be converted to lower-case
-before matching against \fIexp\fR;  however, substitutions specified
-by \fIsubSpec\fR use the original unconverted form of \fIstring\fR.
-.TP 10
-\fB\-\|\-\fR
-Marks the end of switches.  The argument following this one will
-be treated as \fIexp\fR even if it starts with a \fB\-\fR.
-.PP
-The command returns a count of the number of matching ranges that
-were found and replaced.
-See the manual entry for \fBregexp\fR for details on the interpretation
-of regular expressions.
-
-.SH KEYWORDS
-match, pattern, regular expression, substitute