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<?php $s = "Example of valid matches: NE1, NE17, NE49 Invalid matches: NE61, NE70"; if (preg_match_all('~\bNE(?!(?:6[1-9]|7[01])\b)\d{1,2}\b~', $s, $matches)) { print_r($matches[0]); }
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => NE1 [1] => NE17 [2] => NE49 )

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