c# - 我需要一些文本解析帮助(正则表达式/C#)

Question

我可以借助适当的正则表达式将以下字符串解析为 3 个变量。带有注释的部分 //TODO: 是我需要正则表达式帮助的地方。现在我刚刚分配了一个静态值，但需要用解析示例文本的真实正则表达式替换它。谢谢!

// This is what a sample text will look like.
var text = "Cashpay @username 55 This is a sample message";

// We need to parse the text into 3 variables.
// 1) username - the user the payment will go to.
// 2) amount - the amount the payment is for.
// 3) message - an optional message for the payment.
var username = "username"; // TODO: Get the username value from the text.
var amount = 55.00; // TODO: Get the amount from the text.
var message = "This is a sample message"; // TODO: Get the message from the text.

// now write out the variables
Console.WriteLine("username: " + username);
Console.WriteLine("amount: " + amount);
Console.WriteLine("message: " + message);

Answer 1

您可以使用捕获组:

var regex = new Regex(@"^Cashpay\s+@([A-Za-z0-9_-]+)\s+(\d+)\s+(.+)$");
var text = "Cashpay @username 55 This is a sample message";

var match = regex.Match(text);

if (!match.Success)
    //Bad string! Waaaah!

string username = match.Groups[1].Value;
int amount = int.Parse(match.Groups[2].Value);
string message = match.Groups[3].Value;