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<?php $subject = "101010101"; $pattern = "/[01]{1,4}/"; preg_match_all($pattern, $subject, $match); echo '<pre>', print_r($match[0]);
Output for git.master, git.master_jit, rfc.property-hooks
<pre>Array ( [0] => 1010 [1] => 1010 [2] => 1 ) 1

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