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<?php $a = 'Ukraine - Russia or Iran - Argentina'; preg_match('/([ ]*[-]?[ ]*){1}(or){1}/', $a, $m, PREG_OFFSET_CAPTURE); var_dump($m);
Output for 4.3.0 - 7.1.0
array(3) { [0]=> array(2) { [0]=> string(3) " or" [1]=> int(16) } [1]=> array(2) { [0]=> string(1) " " [1]=> int(16) } [2]=> array(2) { [0]=> string(2) "or" [1]=> int(17) } }