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run code in 200+ php & hhvm versions
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<?php $str1 = 'The quick brown fox'; echo preg_replace('/\W\w+\s*(\W*)$/', '$1', $str1); ?>
Output for 4.3.0 - 7.1.7, 7.2.0
The quick brown
Output for 7.1.10

Process exited with code 137.