URLValidator

gistfile1.php

<?php
class Nully_Validate_Uri extends Zend_Validate_Abstract {
    const INVALID_URI = "%value% is invalid URI";

    /**
     * Checking for http including URI pattern.
     *
     * @uses Zend_Uri
     *       Zend_Uri::check method is checking URI scheme including pattern.
     */
    public function isValid($value) {
        $value = (string)$value;
        $this->_setValue($value);

        if(Zend_Uri::check($value)) {
            $this->_error(self::INVALID_URI);
            return false;
        }

        return true;
    }
}