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run code in 150+ php & hhvm versions
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<?php var_dump(preg_match_all("~ :[^ \n]+ ~", "Toto je nejaký text so smajlíkmi, like this. :D Fuck yourself :/ and magyar :-X :D :-)", $matches) ); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(3) array(1) { [0]=> array(3) { [0]=> string(4) " :D " [1]=> string(4) " :/ " [2]=> string(5) " :-X " } }