Description: It would be highly beneficial to have the ability to use regular expressions (regex) to validate user-defined custom attributes in SimpleMDM. This feature would allow administrators to set specific rules and patterns that user inputs must adhere to, ensuring data accuracy and consistency.

Use Case: For example, suppose an organization has a custom attribute for employee IDs. By implementing regex rules, the administrator can define that the employee ID must follow a specific format, such as a combination of letters and numbers. Any user input that does not match the defined regex pattern would be flagged as invalid, preventing incorrect or inconsistent data from being entered.

Benefits:
1. Data Accuracy: Regex rules will help enforce consistent data entry by ensuring that user inputs meet the specified patterns or formats.
2. Prevent Errors: By validating user inputs against regex rules, potential errors or typos can be caught and corrected before they cause issues downstream.
3. Customization: Administrators can tailor regex rules to match their organization's specific requirements, enabling greater flexibility and control over data validation.

Implementation: The addition of a regex rule field within the custom attribute settings would allow administrators to define the pattern that user inputs must match. SimpleMDM could then validate the input against the regex rule and provide immediate feedback if the input is invalid.

Overall, the inclusion of regex rules for custom attribute validation would enhance the data integrity and usability of SimpleMDM, providing administrators with greater control over user or admin inputs.