+ my($bankno, $branch);
+ if ( $aba =~ /^0(\d{3})(\d{5})$/ ) { # standard format for Canadian bank ID
+ ($bankno, $branch) = ( $1, $2 );
+ } elsif ( $aba =~ /^(\d{5})\.(\d{3})$/ ) { #how we store branches
+ ($branch, $bankno) = ( $1, $2 );
+ } else {
+ die "invalid branch/routing number '$aba'\n";
+ }
+