c# - 如何在c#中根据日期拆分字符串数据

Question

我有带日期的字符串，想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"

我想根据日期拆分它

"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，但它拆分为换行符而不是日期

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

谁能建议如何拆分这个..

Answer 1

正则表达式可能是您的解决方案。

使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

像这样:

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 splitting完成它