How To: Maintain input data format when masking

If you have to mask a column “Record number” that has alphanumeric value. Length and format is not consistent. I need to mask each character with equivalent character i.e. alphabet with an alphabet and number with a number.

For example:

One way to achieve this would be to use the key masking technique twice. Create two key masking rules – one to mask only characters and another one to mask only digits. Next, create an advanced rule with one input column. Then, create a variable column and pass the input to the first key masking rule and configure it to mask only the numbers in source string characters using only numbers in the result string replacement characters. Pass the output of this to another key masking rule with but this time mask only alphabets using only alphabets.