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<?php $A = "1 131 2 12 53"; preg_match_all("/( |)131( |)/", $A, $phones); var_dump($phones);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> array(1) { [0]=> string(5) " 131 " } [1]=> array(1) { [0]=> string(1) " " } [2]=> array(1) { [0]=> string(1) " " } }

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