<cfscript>
    function formatPhone( required string phoneNumber ){
        var phoneDigits = reReplace( arguments.phoneNumber, "[^[:digit:]]", "", "all" );
        var phone = "";

        if ( phoneDigits.len() < 10 ){
            var paddingCt = 10 - phoneDigits.len();
            for ( var i = 0; i < paddingCT; i++ ){
                phone &= '0';
            }
            phone += phoneDigits;
        }else if( phoneDigits.len() > 10 ){
            phone = right( phoneDigits, 10 );
        }else{
            phone = phoneDigits;
        }
        return phone;
        phone = insert( '-', phone, 6 );
        phone = insert( '-', phone, 3 ) ;

        return phone;
    }

    writeDump( formatPhone( "0001" )  );
</cfscript>