Form validation custom message

I'm using a Rule group for my form validation but I need a custom message for one of the rule. I tried looking through the documentation but nothing was mentioned about this type of use-case. Could anyone help me out on how to go about this: Form Validation -> Rule Group -> Custom Message

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$this->form_validation->set_message() ought to do the trick.

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Form Library provides set_message() method to set message on validate rule, even run CI native rule or custom created rule, see below example

PHP Code:

# required is rule name
# 2nd param for custom message and "%s" for field name.
$this->form_validation->set_message('required', '%s required'); 


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