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run code in 150+ php & hhvm versions
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<?php $a = 'Ukraine -- Russia or Iran - Argentina'; preg_match('/(.+-{1}.+)(or)(.+-{1}.+)/', $a, $m); var_dump($m);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(37) "Ukraine -- Russia or Iran - Argentina" [1]=> string(18) "Ukraine -- Russia " [2]=> string(2) "or" [3]=> string(17) " Iran - Argentina" }