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<?php $samplerequesturi = 'string(42) "{"ERROR_MSG":"Invalid path for user raol"}" '; preg_match('@^string\(\d{1,4}\)@', $samplerequesturi, $out); var_dump($out);
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(10) "string(42)" }