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run code in 150+ php & hhvm versions
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<?php preg_match( '/^http:\/\/.+@(.+)$/' , 'http://info@pcds.ca.in', $matches); echo $matches[1]; // 1234
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.0.9, 7.0.11 - 7.1.0
pcds.ca.in
Output for hhvm-3.13.2, 7.0.10

Process exited with code 137.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/n0rEj on line 3
Process exited with code 255.