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run code in 200+ php & hhvm versions
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<?php var_dump(preg_match("/^[\x20-\x7E]*$/", "\x20\x7E"));
based on f47TB
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
int(1)