How do you extend the Form Validation library?

How do you extend the Form Validation library? - Printable Version

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How do you extend the Form Validation library? - El Forum - 03-29-2011

[eluser]JasonS[/eluser]
All I want to do is update the prefix..

Code:
&lt;?php

class MY_Form_validation extends CI_Form_validation {

    var $_error_prefix            = '<p class="error">';

}

Nothing happens..

How do you extend the Form Validation library? - El Forum - 03-29-2011

[eluser]danmontgomery[/eluser]
http://ellislab.com/codeigniter/user-guide/libraries/form_validation.html#errordelimiters

Code:
$this->form_validation->set_error_delimiters('<div class="error">', '</div>');