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run code in 150+ php & hhvm versions
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<?php preg_match_all('/("|\') ([^"\']+?) \1 /x', "", $m); var_dump($m);
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> array(0) { } [1]=> array(0) { } [2]=> array(0) { } }