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<?php $str = '-9 Cycles 3 Temperature Levels Steam Sanitizet+ -Sensor Dry | ALSO AVAILABLE (PRICES MAY VARY) |- White - 1258843 - DVE45R6100W {+ Platinum - 1501 525 - DVE45R6100P desirable: 1258843 DVE45R6100W'; foreach (explode(' ', $str) as $word) { $length = strlen($word); if ($length >= 4 && $length <= 20 && !isset($result[$word]) && ctype_alnum($word) && !ctype_alpha($word) && $word === strtoupper($word) ) { $result[$word] = $word; } } var_export(array_values($result));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '1258843', 1 => 'DVE45R6100W', 2 => '1501', 3 => 'DVE45R6100P', )

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