c# regex 解析 ical 格式的文件并用结果填充对象

Question

我正在尝试解析具有以下格式的文件:

BEGIN:VEVENT
CREATED:20120504T163940Z
DTEND;TZID=America/Chicago:20120504T130000
DTSTAMP:20120504T164000Z
DTSTART;TZID=America/Chicago:20120504T120000
LAST-MODIFIED:20120504T163940Z
SEQUENCE:0
SUMMARY:Test 1
TRANSP:OPAQUE
UID:21F61281-FB76-467F-A2CC-A666688BD9B5
X-RADICALE-NAME:21F61281-FB76-467F-A2CC-A666688BD9B5.ics
END:VEVENT

我需要获取每行冒号或分号后找到的值，并将它们放入对象的 props 中。我正在尝试使用 Regex 来做到这一点，但在使用它之后我基本上忘记了我所知道的关于 Regex 的一切(可能一年两次)。任何帮助将不胜感激。

Answer 1

编辑

这篇文章让我想到了 iCal 格式。

昨天之前，我还不知道什么是 iCal 格式。但是，在阅读了 1998 年的规范之后，很明显这个页面上的答案都不足以解析内容。而且，即使对于我下面的通用正则表达式来说，它也太复杂了。

考虑到这一点，这里有一个仅解析行内容的解决方案，正如从一般行内容解析规范中收集到的那样。这是朝着正确方向迈出的一步，希望有人能从中受益。它不执行行继续并且不验证。

C#代码

Regex iCalMainRx = new Regex(
 @" ^  (?<name> [^[:cntrl:]"";:,\n]+ )
       (?<parameter>
          ;
          (?<param_name> [^[:cntrl:]"";:,\n]+ )
           = 
          (?<param_value> 
             (?: (?:[^\S\n]|[^[:cntrl:]"";:,])*  | "" (?:[^\S\n]|[^[:cntrl:]""])* "" )
             (?: , (?: (?:[^\S\n]|[^[:cntrl:]"";:,])*  | "" (?:[^\S\n]|[^[:cntrl:]""])* "" ) )*
          )
        )*
        :
        (?<value> (?:[^\S\n]|[^[:cntrl:]])* )
     $ ", RegexOptions.IgnorePatternWhitespace);

Regex iCalPvalRx = new Regex(
 @" ^ (?<pvals> (?:[^\S\n]|[^[:cntrl:]"";:,])*  | "" (?:[^\S\n]|[^[:cntrl:]""])* "" )
      (?: ,+ (?<pvals> (?:[^\S\n]|[^[:cntrl:]"";:,])*  | "" (?:[^\S\n]|[^[:cntrl:]""])* "" ) )*
    $ ", RegexOptions.IgnorePatternWhitespace);


string[] lines = {
    "BEGIN:VEVENT", 
    "CREATED:20120504T163940Z", 
    "DTEND;TZID=America/Chicago:20120504T130000", 
    "DTSTAMP:20120504T164000Z", 
    "DTSTART;TZID=,,,America/Chicago;Next=;last=\"this:;;;:=\";final=:20120504T120000", 
    "LAST-MODIFIED:20120504T163940Z", 
    "SEQUENCE:0", 
    "SUMMARY:Test 1", 
    "TRANSP:OPAQUE", 
    "UID:21F61281-FB76-467F-A2CC-A666688BD9B5", 
    "X-RADICALE-NAME:21F61281-FB76-467F-A2CC-A666688BD9B5.ics", 
    "END:VEVENT", 
};

foreach (string str in lines)
{
    Match m_content = iCalMainRx.Match( str );
    if (m_content.Success)
    {
        Console.WriteLine("Key =   " + m_content.Groups["name"].Value);
        Console.WriteLine("Value = " + m_content.Groups["value"].Value);

        CaptureCollection cc_pname  = m_content.Groups["param_name"].Captures;
        CaptureCollection cc_pvalue = m_content.Groups["param_value"].Captures;
        if (cc_pname.Count > 0)
        {
            Console.WriteLine("Parameters: ");
            for (int i = 0; i < cc_pname.Count; i++)
            {
                // Console.WriteLine("\t'" + cc_pname[i].Value + "'  =   '" + cc_pvalue[i].Value + "'");
                Console.WriteLine("\t'" + cc_pname[i].Value + "' =");
                Match m_vals = iCalPvalRx.Match( cc_pvalue[i].Value );
                if (m_vals.Success)
                {
                    CaptureCollection cc_vals = m_vals.Groups["pvals"].Captures;
                    for (int j = 0; j < cc_vals.Count; j++)
                    {
                        Console.WriteLine("\t\t'" + cc_vals[j].Value + "'");
                    }
                }

            }
        }
        Console.WriteLine("-------------------------");
    }
}

输出

Key =   BEGIN
Value = VEVENT
-------------------------
Key =   CREATED
Value = 20120504T163940Z
-------------------------
Key =   DTEND
Value = 20120504T130000
Parameters:
        'TZID' =
                'America/Chicago'
-------------------------
Key =   DTSTAMP
Value = 20120504T164000Z
-------------------------
Key =   DTSTART
Value = 20120504T120000
Parameters:
        'TZID' =
                ''
                'America/Chicago'
        'Next' =
                ''
        'last' =
                '"this:;;;:="'
        'final' =
                ''
-------------------------
Key =   LAST-MODIFIED
Value = 20120504T163940Z
-------------------------
Key =   SEQUENCE
Value = 0
-------------------------
Key =   SUMMARY
Value = Test 1
-------------------------
Key =   TRANSP
Value = OPAQUE
-------------------------
Key =   UID
Value = 21F61281-FB76-467F-A2CC-A666688BD9B5
-------------------------
Key =   X-RADICALE-NAME
Value = 21F61281-FB76-467F-A2CC-A666688BD9B5.ics
-------------------------
Key =   END
Value = VEVENT
-------------------------