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'\"
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'\" Copyright (c) 1993 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" SCCS: @(#) regsub.n 1.9 96/08/26 13:00:11
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'\"
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.so man.macros
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.TH regsub n 7.4 Tcl "Tcl Built-In Commands"
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.BS
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'\" Note: do not modify the .SH NAME line immediately below!
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.SH NAME
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regsub \- Perform substitutions based on regular expression pattern matching
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.SH SYNOPSIS
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\fBregsub \fR?\fIswitches\fR? \fIexp string subSpec varName\fR
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.BE
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.SH DESCRIPTION
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.PP
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This command matches the regular expression \fIexp\fR against
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\fIstring\fR,
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and it copies \fIstring\fR to the variable whose name is
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given by \fIvarName\fR.
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If there is a match, then while copying \fIstring\fR to \fIvarName\fR
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the portion of \fIstring\fR that
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matched \fIexp\fR is replaced with \fIsubSpec\fR.
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If \fIsubSpec\fR contains a ``&'' or ``\e0'', then it is replaced
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in the substitution with the portion of \fIstring\fR that
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matched \fIexp\fR.
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If \fIsubSpec\fR contains a ``\e\fIn\fR'', where \fIn\fR is a digit
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between 1 and 9, then it is replaced in the substitution with
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the portion of \fIstring\fR that matched the \fIn\fR-th
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parenthesized subexpression of \fIexp\fR.
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Additional backslashes may be used in \fIsubSpec\fR to prevent special
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interpretation of ``&'' or ``\e0'' or ``\e\fIn\fR'' or
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backslash.
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The use of backslashes in \fIsubSpec\fR tends to interact badly
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with the Tcl parser's use of backslashes, so it's generally
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safest to enclose \fIsubSpec\fR in braces if it includes
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backslashes.
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.LP
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If the initial arguments to \fBregexp\fR start with \fB\-\fR then
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they are treated as switches. The following switches are
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currently supported:
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.TP 10
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\fB\-all\fR
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All ranges in \fIstring\fR that match \fIexp\fR are found and
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substitution is performed for each of these ranges.
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Without this switch only the first
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matching range is found and substituted.
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If \fB\-all\fR is specified, then ``&'' and ``\e\fIn\fR''
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sequences are handled for each substitution using the information
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from the corresponding match.
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.TP 10
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\fB\-nocase\fR
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Upper-case characters in \fIstring\fR will be converted to lower-case
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before matching against \fIexp\fR; however, substitutions specified
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by \fIsubSpec\fR use the original unconverted form of \fIstring\fR.
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.TP 10
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\fB\-\|\-\fR
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Marks the end of switches. The argument following this one will
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be treated as \fIexp\fR even if it starts with a \fB\-\fR.
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.PP
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The command returns a count of the number of matching ranges that
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were found and replaced.
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See the manual entry for \fBregexp\fR for details on the interpretation
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of regular expressions.
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.SH KEYWORDS
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match, pattern, regular expression, substitute
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