Hi Deepak,
First of all, the validation Rule in Information Steward - Data Insight module is, to validate the data, so based on what you want to validate, put this logic in the from of code, then system will validates the data according to code and returns True or False (Passed / Failed).
This tool is not used to perform the data integration activities like we do in Data Services. In your example, if you want to check whether the values in $Rule_CHAR_REM start with "." or not, that you can check but you can't use this tool to modify the values.
Thanks,
Ramakrishna Kamurthy
