pos SCALAR

     pos

     Returns the offset of where the last C<m//g> search
     left off for the variable is in question (C<$_> is
     used when the variable is not specified).  May be
     modified to change that offset.  Such modification
     will also influence the C<\G> zero-width assertion in
     regular expressions.  See L<perlre> and L<perlop>.

##</code><code>##

    pos() - length $&

##</code><code>##

    my $R = "foo bar quux baz";
    while ($R =~ /ba.\b/g) {
        print pos($R) - length $&, "\n";
    }

##</code><code>##

    4
    13