You use the Data Quality option in the Data Dictionary to maintain validators for data handling within the solution.
Validators use industry-standard Regular Expressions (RegEx) to specify the validation rules to be applied.
Online tools can assist in defining new expressions for use within this feature. One such service is: Online RegEx validation service (3rd party link)
Once a Validator is defined you may use the Attributes tab to assign it to any text-type attribute in the Data Dictionary to enforce inbound data quality. Only newly entered data is validated.
Only one Validator can be assigned to a given attribute in the Data Dictionary at a time.
Several standard Validators are provided which are not editable.