How to extend a class from the library?

How to extend a class from the library? - Printable Version

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How to extend a class from the library? - El Forum - 03-06-2010

[eluser]Sinclair[/eluser]
Hi,

I need to validade International characters in the Form Validation Class.

I need to change the a class function from:

Code:
function alpha($str)

{

return ( ! preg_match("/^([a-z])+$/i", $str)) ? FALSE : TRUE;

}

Code:
function alpha($str)

{

return ( ! preg_match("/^([*A-Za-zá-úÁ=Ú.\s*])+$/i", $str)) ? FALSE : TRUE;

}

But if I do this. The next time I upgrade Codeigniter I broke it. How can I extend this class?

PS: Newbie in OOP.

Best Regards,

How to extend a class from the library? - El Forum - 03-06-2010

[eluser]2think[/eluser]
Here is a helpful section in the userguide on extending libraries

http://ellislab.com/codeigniter/user-guide/general/creating_libraries.html

Not sure but here is the section on Helpers, just in case you find it easier/better to make your own.

http://ellislab.com/codeigniter/user-guide/general/helpers.html

Hope those help some.