/**
 * Check for Germany IBAN
 */
var regexIBANDE = '([A-Z]{2})([0-9]{2})([0-9]{8})([0-9]{10})';
var matchIBANDE = $('#someid').val().match(regexIBANDE);

console.log('match: iban '+matchIBANDE);

// iban correct
if(matchIBANDE != null) {
    var IBAN = matchIBANDE[0];
    var bankCode = matchIBANDE[3];
    var regexBankAccountNr = '([0]*)([0-9]*)'
    var bankAccountNr = matchIBANDE[4];

    console.log('match: bank '+bankAccountNr.match(regexBankAccountNr));
    bankAccountNr = bankAccountNr.match(regexBankAccountNr);

    // set bank data
    $('#bank_account_bank_account_nr').val(bankAccountNr[2]);
    $('#bank_account_bank_account_bank_code').val(bankCode);
}