<?php $regex = '/X(*MARK:A)Y|X(*MARK:B)Z/'; preg_match($regex, "XY", $matches); echo $matches['MARK'], "\n"; // A preg_match($regex, "XZ", $matches); echo $matches['MARK'], "\n"; // B preg_match($regex, "XP", $matches); echo $matches['MARK'], "\n"; // Should also be B, instead: Notice: Undefined index: MARK
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