我有一个字符串列表，我需要找出'American'它是否在该字符串中。如果存在，那么我想找出美国单词的开始和结束索引
['Here in Americans, people say \xe2\x80\x9cCan I get a bag for the stuff?\xe2\x80\x9d',\n 'Typically in restaurant after you are done with meal, you ask for check in Americans from the waiter.',\n 'When mixing coffee, people in American use creamer, which is equivalent of milk.']\n期望的输出：找出美国单词的开始和结束索引
\n\n8,16\n75,83\n30,38\n