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<?php $string = 'Hello How are you :slight_smile::joy:'; $regex = "/:([a-zA-Z0-9_]*):/"; preg_match_all($regex, $string, $matches); print_r($matches[0]);
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
Array ( [0] => :slight_smile: [1] => :joy: )

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