简单实例:
string s = "2005-2-21";
Regex reg = new Regex(@"(?<y>\d{4})-(?<m>\d{1,2})-(?<d>\d{1,2})",RegexOptions.Compiled);
Match match = reg.Match(s);
int year = int.Parse(match.Groups["y"].Value);
int month = int.Parse(match.Groups["m"].Value);
int day = int .Parse(match.Groups["d"].Value);
DateTime time = new DateTime(year,month,day);
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