想把日期格式"dd\MM\yyyy"用正则表达式替换成"yyyy\MM\dd"

Question

想把日期格式"dd\MM\yyyy"用正则表达式替换成"yyyy\MM\dd"，如"19\03\2012"

Answer 1

不用替换
DateTimestr.ToString("yyyy\MM\dd")

Answer 2

string dr = DateTime.Now.ToString(@"yyyy\\MM\\dd");

Answer 3

参考
http://www.csharpwin.com/csharpspace/9442r8768.shtml

Answer 4

str=Regex.Replace(str,@"(\d{2})\\(\d{2})\\(\d{4})","$3\\$2\\$1");

Answer 5

            string source = @"(aa19\03\2012bb";
            Regex reg = new Regex(@"(?<day>[\d]{2})\\(?<month>[\d]{2})\\(?<year>[\d]{4})");
            source = reg.Replace(source, "${year}\\${month}\\${day}");