var strIBAN = event.value; 
var reIBAN = /^(DE\d{2})(\d{4})(\d{4})(\d{4})(\d{4})(\d{2})$/; 
var reIBANFormat = /^(DE\d{2}) (\d{4}) (\d{4}) (\d{4}) (\d{4}) (\d{2})$/; 
if(reIBANFormat.test(strIBAN) == false) { 
if(reIBAN.test(strIBAN) == true) { 
var formatIBAN = RegExp.$1; 
formatIBAN = formatIBAN + " " + RegExp.$2 + " " + RegExp.$3; 
formatIBAN = formatIBAN + " " + RegExp.$4 + " " + RegExp.$5 + " " + RegExp.$6; 
event.value = formatIBAN; } 
else 
{ 
var message = "Die Länge der IBAN scheint nicht zu stimmen."; app.alert(message); 
} } 

var strIBAN = event.value; 
 
var reIBANDE = /^(DE\d{2})(\d{4})(\d{4})(\d{4})(\d{4})(\d{2})$/; 
var reIBANAT = /^(AT\d{2})(\d{4})(\d{4})(\d{4})(\d{4})$/; 
var reIBANCH = /^(CH\d{2})(\d{4})(\d{4})(\d{4})(\d{4})(\d{1})$/; 
 
var reIBANFormatDE = /^(DE\d{2}) (\d{4}) (\d{4}) (\d{4}) (\d{4}) (\d{2})$/; 
var reIBANFormatAT = /^(AT\d{2}) (\d{4}) (\d{4}) (\d{4}) (\d{4})$/; 
var reIBANFormatCH = /^(CH\d{2}) (\d{4}) (\d{4}) (\d{4}) (\d{4}) (\d{1})$/; 
 
if(strIBAN.substring(0,2) == "DE"){ 
if(reIBANFormatDE.test(strIBAN) == false) { 
if(reIBANDE.test(strIBAN) == true) { 
var formatIBAN = RegExp.$1; 
formatIBAN = formatIBAN + " " + RegExp.$2 + " " + RegExp.$3; 
formatIBAN = formatIBAN + " " + RegExp.$4 + " " + RegExp.$5 + " " + RegExp.$6; 
event.value = formatIBAN; } 
else 
{ 
var message = "Die Länge der DE-IBAN ist nicht 22 Zeichen!"; app.alert(message); 
} } } 
else { 
if(strIBAN.substring(0,2) == "AT") { 
if(reIBANFormatAT.test(strIBAN) == false) { 
if(reIBANAT.test(strIBAN) == true) { 
var formatIBAN = RegExp.$1; 
formatIBAN = formatIBAN + " " + RegExp.$2 + " " + RegExp.$3; 
formatIBAN = formatIBAN + " " + RegExp.$4 + " " + RegExp.$5; 
event.value = formatIBAN; } 
else 
{ 
var message = "Die Länge der AT-IBAN ist nicht 20 Zeichen!"; app.alert(message); 
} } } 
else{ 
if(strIBAN.substring(0,2) == "CH") { 
if(reIBANFormatCH.test(strIBAN) == false) { 
if(reIBANCH.test(strIBAN) == true) { 
var formatIBAN = RegExp.$1; 
formatIBAN = formatIBAN + " " + RegExp.$2 + " " + RegExp.$3; 
formatIBAN = formatIBAN + " " + RegExp.$4 + " " + RegExp.$5 + " " + RegExp.$6; 
event.value = formatIBAN; } 
else 
{ 
var message = "Die Länge der CH-IBAN ist nicht 21 Zeichen!"; app.alert(message); 
} } } 
else 
{ 
var message = "Weder eine deutsche, noch eine österreichische, noch eine schweizerische IBAN!"; app.alert(message); 
} } } 

case "A": format = "0-9A-Za-z"; break; 
case "B": format = "0-9A-Z"; break; 
case "C": format = "A-Za-z"; break; 
case "F": format = "0-9"; break; 
case "L": format = "a-z"; break; 
case "U": format = "A-Z"; break; 
case "W": format = "0-9a-z"; break;