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<?php $string = "001122334 001122334455 0011 0011223344556677"; if (preg_match_all('/\b[a-fA-F0-9]{12}\b/', $string, $matches)) { print_r($matches[0]); }
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Array ( [0] => 001122334455 )

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