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<?php if (preg_match( '/\b((IA|IO|A|O|D)[0-9]{6})(-*(R|revised)[\w]*)*\b/i', trim("Outbound Quote: O529012-R12421 Houston to blah blah"), $matches ) ) { var_dump($matches); }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(5) { [0]=> string(14) "O529012-R12421" [1]=> string(7) "O529012" [2]=> string(1) "O" [3]=> string(7) "-R12421" [4]=> string(1) "R" }

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261.13 ms | 406 KiB | 369 Q