什么是实现我的简单语法的正则表达式模式？

Question

我需要处理一些遗留数据并解析一些模糊的正式文本字段。我没有尝试使用正则表达式匹配，而是考虑构建一些简单的语法定义，并使用一些工具来基于此解析字符串。

要解析的其中一列的一些示例数据

08-JUL-13 To 09-AUG-13   BREAKFAST  0900 LUNCH  1230

或

08-JUL-13 To 22-AUG-13   LUNCH  1230

或

08 JUL 13 To 16 AUG 13  EAST WARD LUN  0200

所以我的语法就像这样，正确的正则表达式模式是什么？

DateRange:[DateWithOrWithoutDashes TO DateWithOrWithoutDashes]  {BlaBla}0..* {Break* Time}0..1 {Lun Time}0..1

Answer 1

此模式将与您的所有示例相匹配。

([0-9])+(-| )([A-Z])+(-| )([0-9])+(-| )+(To)(-| )+([0-9])+(-| )([A-Z\])+(-| )([0-9])+(( )+([A-Z])+( )+([0-9])+)+

Answer 2

您可以尝试以下正则表达式：

^(?<start_date>\d{2}-?[A-Z]{3}-?\d{2})\s+To\s+(?<end_date>\d{2}-?[A-Z]{3}-?\d{2})\s+(?:(?<type>[A-Z\s]+?)\s+(?<time>\d{4})\s*)+

Debuggex Demo

C＃代码示例：

string[] lines = {
                     "08-JUL-13 To 09-AUG-13   BREAKFAST  0900 LUNCH  1230",
                     "08-JUL-13 To 22-AUG-13   LUNCH  1230",
                     "08 JUL 13 To 16 AUG 13  EAST WARD LUN  0200"
                 };
foreach (string line in lines)
{
    Match m = Regex.Match(line, @"^(?<start_date>\d{2}[-\s][A-Z]{3}[-\s]\d{2})\s+To\s+(?<end_date>\d{2}[-\s][A-Z]{3}[-\s]\d{2})\s+(?:(?<type>[A-Z\s]+?)\s+(?<time>\d{4})\s*)+");
    if (m.Success)
    {
        Console.WriteLine("Start date: {0}", m.Groups["start_date"].Value);
        Console.WriteLine("End date: {0}", m.Groups["end_date"].Value);
        for (int i = 0; i < m.Groups["type"].Captures.Count; i++)
        {
            Console.WriteLine("Event type[{0}]: {1}", i, m.Groups["type"].Captures[i].Value);
            Console.WriteLine("Event time[{0}]: {1}", i, m.Groups["time"].Captures[i].Value);
        }
        Console.WriteLine();
    }
}

输出：

Start date: 08-JUL-13
End date: 09-AUG-13
Event type[0]: BREAKFAST
Event time[0]: 0900
Event type[1]: LUNCH
Event time[1]: 1230

Start date: 08-JUL-13
End date: 22-AUG-13
Event type[0]: LUNCH
Event time[0]: 1230

Start date: 08 JUL 13
End date: 16 AUG 13
Event type[0]: EAST WARD LUN
Event time[0]: 0200