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<?php var_dump(preg_match_all("~:.+~", "Toto je nejaký text so smajlíkmi, like this. :D Fuck yourself :/ and magyar :-X :D :-)", $matches) ); var_dump($matches);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
int(2) array(1) { [0]=> array(2) { [0]=> string(19) ":D Fuck yourself :/" [1]=> string(10) ":-X :D :-)" } }

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254.6 ms | 406 KiB | 456 Q