Custom event attribute check http

/*
 this snippet will check if custom event attribute contains http:// or not

 Sample Usage:

 {is_not_valid_url}
 <a href="http://#_ATT{test}">#_ATT{test}</a>
 {/is_not_valid_url}

 {is_valid_url}
 <a href="#_ATT{test}">#_ATT{test}</a>
 {/is_valid_url}

  **Replace "test" with your custom event attribute

 */
function filterEventOutputCondition($replacement, $condition, $match, $EM_Event){
    if (is_object($EM_Event)) {

        switch ($condition) {


            case 'is_valid_url':

                if (is_array($EM_Event->event_attributes) &&  substr($EM_Event->event_attributes['test'], 0, 7) == 'http://'  )
                    $replacement = preg_replace('/\{\/?is_valid_url\}/', '', $match);
                else
                    $replacement = '';
                break;

            case 'is_not_valid_url':

                if (is_array($EM_Event->event_attributes) &&  substr($EM_Event->event_attributes['test'], 0, 7) != 'http://' )
                    $replacement = preg_replace('/\{\/?is_not_valid_url\}/', '', $match);
                else
                    $replacement = '';
                break;

        }

    }

    return $replacement;
}

add_filter('em_event_output_condition', 'filterEventOutputCondition', 100, 4);