C# 如何在c中根据日期分割字符串数据#

我有带日期的字符串，希望根据日期拆分为单独的字符串

例如：我有这种类型的字符串数据

"21/04/21, 1:54 pm - Person1: Really a very useful website to know the products.\n\nhttps://www.google.com\n21/04/21, 2:08 pm - Person2: this is second text\n21/04/21, 2:53 pm - Person3: Really a very useful website for question and answers.\n\nhttps://www.stackoverflow.com\n"

我想根据日期将其拆分，如

"21/04/21, 1:54 pm - Person1: Really a very useful website to know the products.\n\nhttps://www.google.com"
"21/04/21, 2:08 pm - Person2: this is second text"
"22/04/21, 2:53 pm - Person3: Really a very useful website for question and answers.\n\nhttps://www.stackoverflow.com\n"

我试过下面的代码，但它是作为换行符而不是日期拆分的

string[] lines = text.Split(new[] { "\r\n", "\r", "\n" },StringSplitOptions.None);

---

任何人都可以建议如何拆分此..

正则表达式可能是您的解决方案

用正则表达式查找日期模式位置：

^[0-9]{2}/[0-9]{2}/[0-9]{2}[0-9]：[0-9]{2}（pm | am）

使用日期位置拆分字符串

大概是这样的：

Regex regex = new Regex("^[0-9]{2}/[0-9]{2}/[0-9]{2}, [0-9]:[0-9]{2} (pm|am)", RegexOptions.Multiline);
            var source = @"
21/04/21, 1:54 pm - Person1: Really a very useful website to know the products.

https://www.google.com
21/04/21, 2:08 pm - Person2: this is second text
21/04/21, 2:53 pm - Person3: Really a very useful website for question and answers.
https://www.stackoverflow.com";
            var matches = regex.Matches(source);
            foreach (Match match in matches)
            {
                var g = match.Groups[0];
                Console.WriteLine($"{g.Index} : {g.Value}");
            }

将产生以下输出，这是我的第一步建议：

2 : 21/04/21, 1:54 pm
109 : 21/04/21, 2:08 pm
159 : 21/04/21, 2:53 pm

我让你用sring spliting来完成它

我想要一个完整的答案

 static void Main(string[] args)
        {
            Regex regex = new Regex("^[0-9]{2}/[0-9]{2}/[0-9]{2}, [0-9]:[0-9]{2} (pm|am)", RegexOptions.Multiline);
            var source = @"
21/04/21, 1:54 pm - Person1: Really a very useful website to know the products.

https://www.google.com
21/04/21, 2:08 pm - Person2: this is second text
21/04/21, 2:53 pm - Person3: Really a very useful website for question and answers.
https://www.stackoverflow.com";
            var matches = regex.Matches(source);
            foreach (Match match in matches)
            {
                var g = match.Groups[0];
                Console.WriteLine($"{g.Index} : {g.Value}");
            }

            for (int i = 0; i < matches.Count - 1; i++)
            {
                int start = matches[i].Index;
                int end = matches[i + 1].Index;
                var item = source.Substring(start, end - start);
                Console.WriteLine("---------");
                Console.WriteLine(item);
            }

            var lastitem = source.Substring(matches.Last().Index);
            Console.WriteLine("---------");
            Console.WriteLine(lastitem);
        }

string x=“21/04/21，下午1:54-Person1:了解这些产品真是一个非常有用的网站。\n\nhttps://www.google.com\n21/04/21，下午2:08-Person2:这是第二个文本\n21/04/21，下午2:53-Person3:这是一个非常有用的问答网站。\n\nhttps://www.stackoverflow.com\n”；
List lines=x.Split（新[]{“\r\n”，“\r”，“\n”}，StringSplitOptions.None）；
RemoveAll（s=>string.IsNullOrWhiteSpace（s））；
对于（int i=0；i

---

这是否回答了您的问题？如果日期总是跟在“-”之后，那么就把它分开。”——“hypen出现在文本之间，也可以工作，但如果我尝试在12:08时返回，则不会返回预期结果。你能帮我在正则表达式中找到需要修改的地方吗。[0-9]+在正则表达式中添加了这个，以接受时间格式的2位数字

---------
21/04/21, 1:54 pm - Person1: Really a very useful website to know the products.

https://www.google.com

---------
21/04/21, 2:08 pm - Person2: this is second text

---------
21/04/21, 2:53 pm - Person3: Really a very useful website for question and answers.
https://www.stackoverflow.com

string x = "21/04/21, 1:54 pm - Person1: Really a very useful website to know the products.\n\nhttps://www.google.com\n21/04/21, 2:08 pm - Person2: this is second text\n21/04/21, 2:53 pm - Person3: Really a very useful website for question and answers.\n\nhttps://www.stackoverflow.com\n";
        List<string> lines = x.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.None).ToList();
        lines.RemoveAll(s => string.IsNullOrWhiteSpace(s));

        for (int i=0; i < lines.Count(); i++)
        {
           
            if (lines[i].StartsWith("http"))
            {
                lines[i - 1] = lines[i - 1] + "  " + lines[i];
                lines.Remove(lines[i]);
            }
            
        }
        for (int i = 0; i < lines.Count(); i++)
        {
            lines[i] = lines[i].Substring(lines[i].IndexOf(": ")).Remove(0,2);
            Console.WriteLine(lines[i]);
        }