@chusikowski let’s say your full text is var_strFT. Use string class remove method to remove the NewLine from the entire string i.e. var_strFT.Replace() method by specifying the Environment.NewLine method to remove newline cahracters. And then you can substring characters from var_strFT.Substring(idx,len) method to get value of Nr.:
try a little search on both methods and you will get it, if still stuck will check further!!
@chusikowski
give a try on strvar.Split(Environment.NewLine.toArray).Where(Function (s) s.StartsWith(“Nr”)).Select(Function(s) s.Split(":"c)(1).trim).first()