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<?php var_export( preg_split( '~\D+\d{4}\K~', 'ABCDE1234ABCD1234ABCDEF1234', 0, PREG_SPLIT_NO_EMPTY ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'ABCDE1234', 1 => 'ABCD1234', 2 => 'ABCDEF1234', )

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