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<?php $days = 'MTWTHFS'; $split = preg_split('/.H?\K/', $days, 0, PREG_SPLIT_NO_EMPTY); var_export($split);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'M', 1 => 'T', 2 => 'W', 3 => 'TH', 4 => 'F', 5 => 'S', )

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