Tcl Source Code

and
.QW \e\fIn\fR
sequences are handled for each substitution using the information
from the corresponding match.
.TP
\fB\-command\fR
.VS 8.7
Changes the handling of \fIsubSpec\fR so that it is not treated
as a template for a substitution string and the substrings
.QW &
and
.QW \e\fIn\fR
no longer have special meaning. Instead \fIsubSpec\fR must be a

command prefix, that is, a non-empty list.  The substring of \fIstring\fR
that matches \fIexp\fR, and then each substring that matches each
capturing sub-RE within \fIexp\fR are appended as additional elements
to that list. (The items appended to the list are much like what
\fBregexp\fR \fB-inline\fR would return).  The completed list is then
evaluated as a Tcl command, and the result of that command is the

substitution string.  Any error or exception from command evaluation
becomes an error or exception from the \fBregsub\fR command.
.RS
.PP
If \fB\-all\fR is not also given, the command callback will be invoked at most
once (exactly when the regular expression matches). If \fB\-all\fR is given,
the command callback will be invoked for each matched location, in sequence.
The exact location indices that matched are not made available to the script.
.PP