Customer Voice: Text field with Custom Restrictions character limit

Hi All,

I am trying to create a Customer Voice survey. I Added a new text field (counties) and selected Restrictions > Custom. I am trying to enter a regular expression to restrict user to enter only relevant counties in the field. However, my whole regular expression doesn't fit in there due to the character limit in that field. Is there any work around for this?

Thank you,

Praveen.