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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match('/./u', "a\xC4"));
Output for 5.3.4 - 7.2.0
bool(false)
Output for 4.3.5 - 5.3.3
int(0)
Output for 4.3.0 - 4.3.4
int(1)