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<?php $string = 'i must say hello to my handsome friends'; echo preg_replace_callback('/(\b)?\w(?(1)|\b)/', fn($m) => strtoupper($m[0]), $string);
Output for git.master, git.master_jit, rfc.property-hooks
I MusT SaY HellO TO MY HandsomE FriendS

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