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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\" Copyright (c) 2000 Scriptics Corporation.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH regsub n 8.3 Tcl "Tcl Built-In Commands"
-.so man.macros
-.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 \fR?\fIvarName\fR?
-.BE
-.SH DESCRIPTION
-.PP
-This command matches the regular expression \fIexp\fR against
-\fIstring\fR,
-and either copies \fIstring\fR to the variable whose name is
-given by \fIvarName\fR or returns \fIstring\fR if \fIvarName\fR is not
-present.
-(Regular expression matching is described in the \fBre_syntax\fR
-reference page.)
-If there is a match, then while copying \fIstring\fR to \fIvarName\fR
-(or to the result of this command if \fIvarName\fR is not present)
-the portion of \fIstring\fR that
-matched \fIexp\fR is replaced with \fIsubSpec\fR.
-If \fIsubSpec\fR contains a
-.QW &
-or
-.QW \e0 ,
-then it is replaced in the substitution with the portion of
-\fIstring\fR that matched \fIexp\fR.
-If \fIsubSpec\fR contains a
-.QW \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
-.QW & ,
-.QW \e0 ,
-.QW \e\fIn\fR
-and backslashes.
-The use of backslashes in \fIsubSpec\fR tends to interact badly
-with the Tcl parser's use of backslashes, so it is generally
-safest to enclose \fIsubSpec\fR in braces if it includes
-backslashes.
-.LP
-If the initial arguments to \fBregsub\fR start with \fB\-\fR then
-they are treated as switches.  The following switches are
-currently supported:
-.TP
-\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
-.QW &
-and
-.QW \e\fIn\fR
-sequences are handled for each substitution using the information
-from the corresponding match.
-.TP
-\fB\-expanded\fR
-.
-Enables use of the expanded regular expression syntax where
-whitespace and comments are ignored.  This is the same as specifying
-the \fB(?x)\fR embedded option (see the \fBre_syntax\fR manual page).
-.TP
-\fB\-line\fR
-.
-Enables newline-sensitive matching.  By default, newline is a
-completely ordinary character with no special meaning.  With this flag,
-.QW [^
-bracket expressions and
-.QW .
-never match newline,
-.QW ^
-matches an empty string after any newline in addition to its normal
-function, and
-.QW $
-matches an empty string before any newline in
-addition to its normal function.  This flag is equivalent to
-specifying both \fB\-linestop\fR and \fB\-lineanchor\fR, or the
-\fB(?n)\fR embedded option (see the \fBre_syntax\fR manual page).
-.TP
-\fB\-linestop\fR
-.
-Changes the behavior of
-.QW [^
-bracket expressions and
-.QW .
-so that they
-stop at newlines.  This is the same as specifying the \fB(?p)\fR
-embedded option (see the \fBre_syntax\fR manual page).
-.TP
-\fB\-lineanchor\fR
-.
-Changes the behavior of
-.QW ^
-and
-.QW $
-(the
-.QW anchors )
-so they match the
-beginning and end of a line respectively.  This is the same as
-specifying the \fB(?w)\fR embedded option (see the \fBre_syntax\fR
-manual page).
-.TP
-\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
-\fB\-start\fR \fIindex\fR
-.
-Specifies a character index offset into the string to start
-matching the regular expression at.
-The \fIindex\fR value is interpreted in the same manner
-as the \fIindex\fR argument to \fBstring index\fR.
-When using this switch,
-.QW ^
-will not match the beginning of the line, and \eA will still
-match the start of the string at \fIindex\fR.
-\fIindex\fR will be constrained to the bounds of the input string.
-.TP
-\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
-If \fIvarName\fR is supplied, the command returns a count of the
-number of matching ranges that were found and replaced, otherwise the
-string after replacement is returned.
-See the manual entry for \fBregexp\fR for details on the interpretation
-of regular expressions.
-.SH EXAMPLES
-.PP
-Replace (in the string in variable \fIstring\fR) every instance of
-\fBfoo\fR which is a word by itself with \fBbar\fR:
-.PP
-.CS
-\fBregsub\fR -all {\emfoo\eM} $string bar string
-.CE
-.PP
-or (using the
-.QW "basic regular expression"
-syntax):
-.PP
-.CS
-\fBregsub\fR -all {(?b)\e<foo\e>} $string bar string
-.CE
-.PP
-Insert double-quotes around the first instance of the word
-\fBinteresting\fR, however it is capitalized.
-.PP
-.CS
-\fBregsub\fR -nocase {\eyinteresting\ey} $string {"&"} string
-.CE
-.PP
-Convert all non-ASCII and Tcl-significant characters into \eu escape
-sequences by using \fBregsub\fR and \fBsubst\fR in combination:
-.PP
-.CS
-# This RE is just a character class for almost everything "bad"
-set RE {[][{};#\e\e\e$ \er\et\eu0080-\euffff]}
-
-# We will substitute with a fragment of Tcl script in brackets
-set substitution {[format \e\e\e\eu%04x [scan "\e\e&" %c]]}
-
-# Now we apply the substitution to get a subst-string that
-# will perform the computational parts of the conversion. Note
-# that newline is handled specially through \fBstring map\fR since
-# backslash-newline is a special sequence.
-set quoted [subst [string map {\en {\e\eu000a}} \e
-        [\fBregsub\fR -all $RE $string $substitution]]]
-.CE
-.SH "SEE ALSO"
-regexp(n), re_syntax(n), subst(n), string(n)
-.SH KEYWORDS
-match, pattern, quoting, regular expression, substitution
-'\" Local Variables:
-'\" mode: nroff
-'\" End: