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run code in 200+ php & hhvm versions
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<?php $syntax='/^\s*(.*?)\s*$/'; preg_match($syntax, ' abc ', $matches); var_dump($matches);
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.1.7
array(2) { [0]=> string(23) " abc " [1]=> string(3) "abc" }