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run code in 200+ php & hhvm versions
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<?php var_dump(preg_match('/^[^(\s\s+)]$/u', 'ke y w o r d'));
based on 0qE05
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.0rc4
int(0)