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run code in 150+ php & hhvm versions
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<?php $samplerequesturi = 'string(42) "{"ERROR_MSG":"Invalid path for user raol"}" '; preg_match('@^string@', $samplerequesturi, $out); var_dump($out);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(6) "string" }
Output for hhvm-3.10.0

Process exited with code 153.