从字符串C#中查找日期时间

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了从字符串C#中查找日期时间，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含3387字，纯文字阅读大概需要5分钟。

内容图文

说我有一个看起来像这样的字符串D1011608201313

第一部分是随机字母,中间部分是日期格式,如dd / mm / yyyy,梯形图是记录的ID.但是第一部分可能是随机的

像[Random String] [DateTime] [ID]一样,我如何找到日期时间的位置.随机字符串的长度约为4到8个字符.

如果我可以找到日期时间,那应该是很直接的:)

解决方法:

您可以使用此RegEx来假设日期为DDMMYYYY格式,并且日期在1900-2099年的范围内,但是可能会有歧义.我还根据您对日期是当前月份的问题的评论对此进行了更新.

public static void Main()
{ 
  // Leaves room for ambiguity if the random prefix or index suffix look 
  // like dates as well.
  var pattern = "((0[1-9]|[12][0-9]|3[01])(0[1-9]|1[012])((19|20)[0-9]{2}))";

  // Or, I see in your comment that the dates are from the current month. 
  // If so then this decreases the probability of a false match. You could
  // use the following pattern instead:
  var year =  DateTime.Today.Year;
  var month  = string.Format("{0:00}", DateTime.Today.Month);
  pattern = "((0[1-9]|[12][0-9]|3[01])(" + month + ")(" + year + "))";        

  var str = "D1011608201313";
  var matches = Regex.Matches(str, pattern);
  if (matches.Count == 0) return;

  var groups = matches[0].Groups;     
  int d, m, y;
  int.TryParse(groups[2].Value, out d);
  int.TryParse(groups[3].Value, out m);
  int.TryParse(groups[4].Value, out y);
  var date = new DateTime(y, m, d);
  Console.WriteLine(date);
}

RegEx的详细分类(来自RegexBuddy)：

((0[1-9]|[12][0-9]|3[01])(0[1-9]|1[012])((19|20)[0-9]{2}))

Match the regular expression below and capture its match into backreference number 1 ?((0[1-9]|[12][0-9]|3[01])(0[1-9]|1[012])((19|20)[0-9]{2}))?
   Match the regular expression below and capture its match into backreference number 2 ?(0[1-9]|[12][0-9]|3[01])?
      Match either the regular expression below (attempting the next alternative only if this one fails) ?0[1-9]?
         Match the character “0” literally ?0?
         Match a single character in the range between “1” and “9” ?[1-9]?
      Or match regular expression number 2 below (attempting the next alternative only if this one fails) ?[12][0-9]?
         Match a single character present in the list “12” ?[12]?
         Match a single character in the range between “0” and “9” ?[0-9]?
      Or match regular expression number 3 below (the entire group fails if this one fails to match) ?3[01]?
         Match the character “3” literally ?3?
         Match a single character present in the list “01” ?[01]?
   Match the regular expression below and capture its match into backreference number 3 ?(0[1-9]|1[012])?
      Match either the regular expression below (attempting the next alternative only if this one fails) ?0[1-9]?
         Match the character “0” literally ?0?
         Match a single character in the range between “1” and “9” ?[1-9]?
      Or match regular expression number 2 below (the entire group fails if this one fails to match) ?1[012]?
         Match the character “1” literally ?1?
         Match a single character present in the list “012” ?[012]?
   Match the regular expression below and capture its match into backreference number 4 ?((19|20)[0-9]{2})?
      Match the regular expression below and capture its match into backreference number 5 ?(19|20)?
         Match either the regular expression below (attempting the next alternative only if this one fails) ?19?
            Match the characters “19” literally ?19?
         Or match regular expression number 2 below (the entire group fails if this one fails to match) ?20?
            Match the characters “20” literally ?20?
      Match a single character in the range between “0” and “9” ?[0-9]{2}?
         Exactly 2 times ?{2}?

内容总结

以上是互联网集市为您收集整理的从字符串C#中查找日期时间全部内容，希望文章能够帮你解决从字符串C#中查找日期时间所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端