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run code in 150+ php & hhvm versions
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<?php print preg_quote(urlencode("http://google.com?asdfsadfsd=asdf&asdfsdf=asdfdf")); preg_match('/[\w%]+/i', '%', $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
http%3A%2F%2Fgoogle\.com%3Fasdfsadfsd%3Dasdf%26asdfsdf%3Dasdfdfarray(1) { [0]=> string(1) "%" }