php - RegEx find "../" or "./" -

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i trying regex tell me if path contains ./ or ../. check user doesn't beyond area. if input contains period before forward slash wont accepted.

e.g. 

/user/selected/path/ - ok  ./user/selected/path/ - failed  ../user/selected/path/ - failed

the forward slash replaced directory_seperator works unix , windows paths.

use this

if (preg_match('#\.(\.)?/#', $path, $match)) echo "error";

if need check ../ or ./ in beginning must use this

if (preg_match('#^\.(\.)?/#', $path, $match)) echo "error";

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