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 modified to change that offset.  Such 
               modification will also influence the "\G" zero-width 
               assertion in regular expressions.  See
               perlre and perlop.
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here is an example -

#!/usr/bin/perl -w
my $state = "mississippi";
while ($state =~ /.i/g) {
    print pos($state),":",$&,$/;
}
__END__
2:mi
5:si
8:si
11:pi
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hope this helps!

cheers

SK