php - Trim url of slash and period -

i trying validate url when sending through form, want make sure begins either https or http, has @ least 1 period, , doesn't have period or trailing slash @ end. have achieved http , period bit through use of regex, can't seem work out how trim url if has either . , ./ , /. or / use rtrim works if finds single characters, there way remove both of them if appear?

here code:

//update canonical url         $canonical_url = $_post ['canonical_url'];         $valid_url =  preg_match('/^(http[s]?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/', $canonical_url );         if ($valid_url) {             $removed_period = rtrim($canonical_url, '.');             $final_canonical = rtrim($removed_period, '/');         } 

you use filter_var validate url , preg_replace trim trailing ., ./, /. or /, if any.

$canonical_url = $_post['canonical_url']; if (filter_var($canonical_url, filter_validate_url, filter_flag_scheme_required)) {     $final_canonical = preg_replace('/(\.|\.\/|\/\.|\/)$/', '', $canonical_url); } 

note filter_validate_url allows rfc 2396 compliant uri, if admit http/https, add:

if(filter_var(…) && strpos($canonical_url, 'http') !== false) {…}