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run code in 200+ 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 - 7.2.0
array(1) { [0]=> string(6) "string" }