I wonder if anyone used ‘Regular Expression’ option as Source for Data Profile Column in Data Load Definitions.

What is the syntax to be used here?
My requirement is to have selector name dynamically for this column based on the page item input during data load.
For example, if page item selected is ‘abc’ selector should be ‘uvw’ or if page item is ‘def’ selector should be ‘xyz’. Like this Selector is dynamically driven by page item.
Please suggest a way to achieve this requirement.