我需要动态构建一个
Regex来捕获给定的关键字,比如
string regex = "(some|predefined|words";
foreach (Product product in products)
regex += "|" + product.Name; // Need to encode product.Name because it can include special characters.
regex += ")";
是否有某种Regex.Encode可以做到这一点？
解决方法
您可以使用
Regex.Escape.例如：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
public class Test
{
static void Main()
{
string[] predefined = { "some","predefined","words" };
string[] products = { ".NET","C#","C# (2)" };
IEnumerable<string> escapedKeywords =
predefined.Concat(products)
.Select(Regex.Escape);
Regex regex = new Regex("(" + string.Join("|",escapedKeywords) + ")");
Console.WriteLine(regex);
}
}
输出：
(some|predefined|words|\.NET|C\#|C\#\ \(2\))
或者没有LINQ,但是根据原始代码在循环中使用字符串连接(我试图避免)：
string regex = "(some|predefined|words";
foreach (Product product)
regex += "|" + Regex.Escape(product.Name);
regex += ")";
