从数组解析正则表达式

Question

I am trying to parse out IP addresses from Outlook email headers. I've started writing some stuff in C# (because that is the example I was leveraging) and have come up with something close.

I can split the headers with the string lines[] = Regex.Split(headers, @"\\r\\n"); command okay, but when I try to iterate through the lines[] array, my regex for IP address fails and does not store the value in a second array:

Code:

private void button1_Click(object sender, EventArgs e)
    {
        // use a string constant to define the mapi property
        string PidTagTransportMessageHeaders = @"http://schemas.microsoft.com/mapi/proptag/0x007D001E";
        string mypattern = @"(#{1,3}\.)(#{1,3}\.)([0-9]{1,3}\.)([0-9]{1,3})";
        // string[] ip = Regex.Split(lines[i], (@"(\(|\[)(#{1,3}\.)(#{1,3}\.)([0-9]{1,3}\.)([0-9]{1,3})(\)|\])"));

        // get a handle on the current message
        Outlook.MailItem message = (Outlook.MailItem)this.OutlookItem;

        // use the property accessor to retreive the header
        string headers = string.Empty;

        try
        {
            headers = (string)message.PropertyAccessor.GetProperty(PidTagTransportMessageHeaders);
        }
        catch { 
        }

        //  if getting the internet headers is successful, put into textbox
        string[] lines = Regex.Split(headers, "\r\n");

        Regex regexObj = new Regex(mypattern);

        for (int i = 0; i < lines.Length; i++)
        {
            MatchCollection matches = regexObj.Matches(lines[i]);                       

        }            
        //eventually write the found IP array into textBox1.Text
       textBox1.Text = headers;
        }
    }
}

Any help or suggestions?

Answer 1

Change your # 's to \\d 's:

string mypattern = @"(\d{1,3}\.)(\d{1,3}\.)(\d{1,3}\.)(\d{1,3})";

Note that a more accurate IPv4 address capture regular expression would be something like:

\b(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\b

...or at least add word boundaries...

\\b(\\d{1,3}\\.)(\\d{1,3}\\.)(\\d{1,3}\\.)(\\d{1,3})\\b

For a simple IPv6 (standard) I like:

(?<![:.\w])(?:[A-F0-9]{1,4}:){7}[A-F0-9]{1,4}(?![:.\w])

Answer 2

IPAddress.Parse方法不会重新发明轮子。

Answer 3

如果您要匹配IPv4，请尝试使用此野兽，它应与实际的IPv4相当接近， \\ b表示单词的开头和结尾，因此您应该能够删除它们并进行调整根据您的标题格式获取您的心脏内容

\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b