The second argument to search is the configuration string bnW, which tells the function to search backwards but not to move the cursor nor to wrap the search.
search的第二个参数是配置字符串bnw，它告诉函数向后搜索，而不是移动游标，也不是封装搜索。
The second argument to search is the configuration string bnW, which tells the function to search backwards but not to move the cursor nor to wrap the search.
search的第二个参数是配置字符串bnw，它告诉函数向后搜索，而不是移动游标，也不是封装搜索。
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