Method test

/**
 * Method to test the url for a valid parts.
 *
 * @param   \SimpleXMLElement  $element  The SimpleXMLElement object representing the `<field>` tag for the form field object.
 * @param   mixed              $value    The form field value to validate.
 * @param   string             $group    The field name group control value. This acts as an array container for the field.
 *                                       For example if the field has name="foo" and the group value is set to "bar" then the
 *                                       full field name would end up being "bar[foo]".
 * @param   Registry           $input    An optional Registry object with the entire data set to validate against the entire form.
 * @param   Form               $form     The form object for which the field is being tested.
 *
 * @return  boolean  True if the value is valid, false otherwise.
 *
 * @since   1.7.0
 */
public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null)
{
    // If the field is empty and not required, the field is valid.
    $required = (string) $element['required'] === 'true' || (string) $element['required'] === 'required';
    if (!$required && empty($value)) {
        return true;
    }
    /*
     * @link http://www.nanpa.com/
     * @link http://tools.ietf.org/html/rfc4933
     * @link http://www.itu.int/rec/T-REC-E.164/en
     *
     * Regex by Steve Levithan
     * @link http://blog.stevenlevithan.com/archives/validate-phone-number
     * @note that valid ITU-T and EPP must begin with +.
     */
    $regexarray = array('NANP' => '/^(?:\\+?1[-. ]?)?\\(?([2-9][0-8][0-9])\\)?[-. ]?([2-9][0-9]{2})[-. ]?([0-9]{4})$/', 'ITU-T' => '/^\\+(?:[0-9] ?){6,14}[0-9]$/', 'EPP' => '/^\\+[0-9]{1,3}\\.[0-9]{4,14}(?:x.+)?$/');
    if (isset($element['plan'])) {
        $plan = (string) $element['plan'];
        if ($plan === 'northamerica' || $plan === 'us') {
            $plan = 'NANP';
        } elseif ($plan === 'International' || $plan === 'int' || $plan === 'missdn' || !$plan) {
            $plan = 'ITU-T';
        } elseif ($plan === 'IETF') {
            $plan = 'EPP';
        }
        $regex = $regexarray[$plan];
        // Test the value against the regular expression.
        if (preg_match($regex, $value) == false) {
            return false;
        }
    } else {
        /*
         * If the rule is set but no plan is selected just check that there are between
         * 7 and 15 digits inclusive and no illegal characters (but common number separators
         * are allowed).
         */
        $cleanvalue = preg_replace('/[+. \\-(\\)]/', '', $value);
        $regex = '/^[0-9]{7,15}?$/';
        if (preg_match($regex, $cleanvalue) == true) {
            return true;
        } else {
            return false;
        }
    }
    return true;
}