IBAN (International Bank Account Number) mini tools (check, trim, expand)

IbanMiniTools.groovy

// really, really, really simple IBAN check and helper methods
boolean ibanCheck(String iban) {
	String iban2 = iban2DB(iban)
	String bban = iban2.substring(4)
	String lkzPrf = iban2.substring(0,4)

	String ibanDec = ""
	(bban + lkzPrf).each { c ->
		if (c >= "0" && c <= "9")
			ibanDec += c
		else if (c >= "A" && c <= "Z")
			ibanDec += ((c as char) - ('A' as char) + 10).toString()
	}
	(new BigInteger(ibanDec)) % 97 == 1 ? true : false
}
	
// transform iban for db and/or sepa-xml etc.
def iban2DB(String iban) {
	iban.replaceAll("\\s", "").toUpperCase()
}
	
// transform eban for displaying and printing
def iban2Display(String iban) {
	String iban2 = iban2DB(iban)
	def ibanDisp = ""
	for (int i = 0; i < iban2.length(); i += 4) {
		if (i > 0)
			ibanDisp += " "
		ibanDisp += iban2.substring(i, Math.min(i +4, iban2.length()))
	}
	ibanDisp
}