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<?php $a = 'Ukraine - Russia or Iran - Argentina'; preg_match('/(.+)-{1}/', $a, $m, PREG_OFFSET_CAPTURE); var_dump($m);
Output for 4.3.0 - 7.2.0
array(2) { [0]=> array(2) { [0]=> string(26) "Ukraine - Russia or Iran -" [1]=> int(0) } [1]=> array(2) { [0]=> string(25) "Ukraine - Russia or Iran " [1]=> int(0) } }