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<?php $strings = ["folders/folder1/folder5/../../folder2", "folders/folder1/../../../folder2", "folders/folder1/folder5/../folder2"]; foreach ($strings as $url) { $count = 0; do { $url = preg_replace('~(?<![^/])(?!\.\.(?![^/]))[^/]+/\.\.(?:/|$)~', '', $url, -1, $count); } while ($count > 0); echo "$url" . PHP_EOL; }
Output for git.master, git.master_jit, rfc.property-hooks
folders/folder2 ../folder2 folders/folder1/folder2

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