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And then do what with that information? Are you trying to stop the submit or filling a field or what? If it's the former use <a href="https://formidableforms.com/knowledgebase/frm_validate_entry/" target="_blank">frm_validate_entry</a>, if it's the latter, use <a href="https://formidableforms.com/knowledgebase/frm_after_create_entry/" target="_blank">frm_after_create_entry</a>
Yes, I want to stop the submit and show warning.