C＃使用正则表达式从电子邮件标题中提取

Question

So im trying to extract different parts from an email header in C#. I think im just hopeless with Regex.

I have the following:

[["X-Mailgun-Incoming", "Yes"], ["X-Envelope-From", "<dwdwdw@dwdwdw.com>"],["Thread-Topic", "What is status"]]

Using a regex I want say the Thread-Topic

I am trying:

[\\"(Thread)\\-(Topic)\\", (\\")?:[AZ][az][az]+(\\")]

Ideally Id like to just change the words to extract some of the other parameters

Answer 1

Assuming you get raw string

var str = "[[\"X-Mailgun-Incoming\",\"Yes\"],[\"X-Envelope-From\",\"<dwdwdw@dwdwdw.com>\"],[\"Thread-Topic\",\"What is status\"]]";
var arr = str.Split(new string[] { "],[", "[[", "]]" }, StringSplitOptions.RemoveEmptyEntries);
var kpv = arr.Select(x => x.Split(new char[] { ',', '"' }, StringSplitOptions.RemoveEmptyEntries)).ToArray();

Answer 2

If regex i would do something like:

[TestMethod]
public void ParseHeadersToDictionary_MultipleHeaders_HeadersAreParsed()
{
    var emailHeaders = "[[\"X-Mailgun-Incoming\",\"Yes\"],[\"X-Envelope-From\",\"<dwdwdw@dwdwdw.com>\"],[\"Thread-Topic\",\"What is status\"]]";

    var regex = new Regex(@"\[""(?<key>.*?)"",\s?""(?<value>.*?)""]");
    Dictionary<string,string> headers = regex.Matches(emailHeaders).Cast<Match>().ToDictionary(item => item.Groups["key"].Value, item => item.Groups["value"].Value);

    var result = headers["Thread-Topic"];

    Assert.AreEqual("What is status", result);
}