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<?php $a = [ 'sss4444dfdf', //лишние '444444', //много 'sdfsdf', //все не то '', // '4', //мало ]; print_r(preg_filter('/^\D*(\d{2,4}).*$/', '$1', $a));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 4444 [1] => 4444 )

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