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<?php $a = [ 'net_sec1' => 'a', 'net_sec2' => 'b', 'net_sec3' => 'c', 'ss_ks_kw' => 'd', ]; $aa = preg_grep( '/^net_sec(\d+)$/', array_flip($a) ); var_dump($aa);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["a"]=> string(8) "net_sec1" ["b"]=> string(8) "net_sec2" ["c"]=> string(8) "net_sec3" }

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