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run code in 150+ php & hhvm versions
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<?php $raw_string = '152124687951<?xml version="1.0"><culo>Amazing</culo></Document>65464614 abc<?xml version="1.0"><culo>Amazing</culo></Document>abc 152124687951<?xml version="1.0"><culo>Amazing</culo></Document>65464614 abc<?xml version="1.0"><culo>Amazing</culo></Document>abc'; $pattern = '@\\<\\?xml.+Document\\>@'; preg_match_all($pattern, $string, $matches, PREG_PATTERN_ORDER); var_dump($matches);
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: string in /in/iBdnf on line 9 array(1) { [0]=> array(0) { } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: string in /in/iBdnf on line 9 array(1) { [0]=> array(0) { } }