A source file has a column named Dependents. The Dependents column contains more than one name separated by commas. You need to mask the Dependents column and keep the comma in the test data to delimit the names.
For the Dependents column, select Source String Characters. Choose Don’t Mask and enter “,” as the source character to skip. Do not enter quotes.
The Data Masking transformation replaces all the characters in the source string except for the comma.