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<?php $text = "I went to the dog park yesterday and saw @dog4 playing with @dog8 and @dog3 drinking water -- poor @dog33."; preg_match_all('/@(\w+)/', $text, $mentions); var_export($mentions[0]);
Output for rfc.property-hooks, git.master, git.master_jit
array ( 0 => '@dog4', 1 => '@dog8', 2 => '@dog3', 3 => '@dog33', )

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