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run code in 150+ php & hhvm versions
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<?php $str = "SELECT * FROM foo WHERE a = :foo"; preg_match_all('/\b:([a-z0-9_])\b.*+\b:\1\b/i', $str, $matches); var_dump($matches);
Output for 4.3.0 - 7.1.0
array(2) { [0]=> array(0) { } [1]=> array(0) { } }