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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 git.master, git.master_jit, rfc.property-hooks
Array ( [0] => :slight_smile: [1] => :joy: )

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