I am trying to create regex validation on a field named start_time in particular table
$crud->set_rules('start_time','Start Time','regex_match[/^(?:07:30|(0[8-9]|1[0-6]):[03]0)$/]');
reg ex is completed tested on regex101.com
but as I add or edit field I come across with error Unable to access an error message corresponding to your field name Start Time.(regex_match[/^(?:07:30)