string.Split C＃将文本保留在分隔符之外

I am trying to take a list of eMail addresses along with first and last names and convert them to a CSV format. My eMail addresses are in the following format:

我试图获取电子邮件地址列表以及名字和姓氏,并将它们转换为CSV格式。我的电子邮件地址采用以下格式:

First, Last <email1@example.com>; First, Last <email2@example.com>;

The output I need is the following:

我需要的输出如下:

email1@example.com,email2@example.com

I am using the following code:

我使用以下代码:

string[] addresses = addresses_Delimited.Split(new Char[] { '<', '>' });

addresses_Delimited is my list of addresses in the original format.

addresses_Delimited是我原始格式的地址列表。

The problem is that it is not eliminating first and last names; instead it is returning first and last names as entries in the array addresses. So, addresses[0] = "First, Last", addresses[1] = "email1@example.com", and addresses[2] = "; First, Last". All first and last name entries after the first one have a semicolon in them.

问题是它没有消除名字和姓氏;相反,它将返回名字和姓氏作为数组地址中的条目。因此,地址[0] =“第一个,最后一个”,地址[1] =“email1@example.com”,地址[2] =“;第一个,最后一个”。第一个之后的所有名字和姓氏条目都包含分号。

How do I make string.Split remove all text outside "<" and ">"? Do I need to use something else?

如何使string.Split删除“<”和“>”之外的所有文本?我需要使用其他东西吗?

5 个解决方案

#1

Rather than using a Split which does not care that the delimiters are paired up, use a regular expression like this:

而不是使用不关心分隔符配对的Split,使用这样的正则表达式:

<([^>]+)>

When you apply this regex to your input strings, you would capture the content of angular brackets into capturing group number 1:

将此正则表达式应用于输入字符串时,您将捕获角括号的内容到捕获组编号1:

var s = "First, Last <email1@example.com>; First, Last <email2@example.com>;";
Regex regex = new Regex(@"<([^>]+)>");
foreach (Match m in regex.Matches(s)) {
    Console.WriteLine(m.Groups[1]);
}

Demo.

#2

Split won't work in this case. You need to use Regular Expressions. Try this

拆分在这种情况下不起作用。您需要使用正则表达式。试试这个

// using System.Text.RegularExpressions;
// pattern = any number of arbitrary characters between < and >.
var pattern = @"\<(.*?)\>";
var matches = Regex.Matches(addresses_Delimited, pattern);

foreach (Match m in matches) {
    Console.WriteLine(m.Groups[1]);
}

#3

You can do it with split - but it's really ugly:

你可以用拆分来做 - 但它真的很难看:

var text = "First, Last <email1@example.com>; First, Last <email2@example.com>;";

var t = text.TrimEnd(';').Split(';');
foreach (var m in t)
{
    Console.WriteLine(m.Split('<')[1].TrimEnd('>'));
}

Use RegularExpression instead.

请改用RegularExpression。

#4

Assuming (and this is a big assumption) that there are no ; characters in any names or emails and that there are no , characters in any emails, this will work:

假设(这是一个很大的假设)没有;任何名称或电子邮件中的字符以及任何电子邮件中都没有字符,这将起作用:

using System.Linq;
using System.Net.Mail;

...

var input = "First, Last <email1@example.com>; First, Last <email2@example.com>;";

var emails = String.Join(",", input
  .Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries)
  .Select(s => new MailAddress(s).Address));

#5

Split by ";' first, then by "<" and ">".

拆分“;”首先,然后是“<”和“>”。

string inputEmails = "First1, Last1 <email1@example.com>; First2, Last2 <email2@example.com>;";
string[] inputEmailsArray = inputEmails.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
foreach (string email in inputEmailsArray)
{
    string[] inputEmailArray = email.Split(new char[] { '<', '>' }, StringSplitOptions.RemoveEmptyEntries);
    foreach (string emailPart in inputEmailArray)
    {
        string s = emailPart;   // First1, Last1     // email1@example.com
    }
}

#1