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


##</code><code>##

my $var = 'the quick brown fox';

while( $var =~ m/(.)/g ) {
    print "Matched '$1' \@ pos:", pos($var), "\n";
}