Fields validation rules

Hi
I want to customize the field validation rules for email and message as follows:
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1- email should not contain more than 3 dots
2 - text area field should not contain any hyperlink
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I know it is possible using php code but I'm not a programmer

Hi
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What are 3 dots? (Sorry, I'm french). 3 characters?
For the second point, it's very easy. You have to control that field doesn't contain @.

Hi
dots are "."
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How I can control if the field doesn't contain @...do you have an example?

You set a variable $address with field email address:

$address=$this->get("field_address", "");

Then you test this variable, something like...

if (strpos($address, '@') !== false) {// The word WAS found}

Hi
I use text area not email.
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and where I should insert this code in the Validation tab - custom validation of text area field configuration?