问题描述：我想通过正则表达式把时间 11/8/2011 12:30 PM 格式化为2011-11-8
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- C# code
string str = "11/8/2011 12:30 PM "; string result = Regex.Replace(str, @"(\d{1,2})/(\d{1,2})/(\d{4}).+", "$3-$1-$2"); Console.WriteLine(result);