I want to check validation on a fullname class

hey there,
i want a class named fullname to validate if it has Hebrew or English characters. will this code do it:

if ( strpos( $field->cssClass, 'fullname' ) === false ) {
    continue;
 
        $pattern = "/^(?!.*\s\s)"
            . "(?!.*\.\.)"
            . "(?!.*,,)"
            . "[א-תA-Z][א-תa-zA-Z .,]{2,256}$/";
 
        if (preg_match($pattern, $field->cssClass)) {
            $result['is_valid'] = false;
            $result['message']  = empty( $field->errorMessage ) ? __( 'אותיות בעברית/English Characters', 'gravityforms' ) : $field->errorMessage;
        } else {
            $result['is_valid'] = true;
            $result['message']  = '';
        }
    return $result;
}, 10, 4 );