新建一个.NET Core控制台项目，敲入下面代码：
using System;
using System.Text.RegularExpressions;
namespace NetCoreRegularEscapeDemos
{
class Program
{
static void Main(string[] args)
{
string text1 = "\n good day!";
string pattern1 = "^\n.+$";
string pattern2 = "^\\n.+$";
string pattern3 = "^\\\n.+$";
bool isMatched1 = false;
bool isMatched2 = false;
bool isMatched3 = false;
isMatched1 = Regex.IsMatch(text1, pattern1);//true
isMatched2 = Regex.IsMatch(text1, pattern2);//true
isMatched3 = Regex.IsMatch(text1, pattern3);//true
Console.WriteLine("isMatched1={0}", isMatched1);
Console.WriteLine("isMatched2={0}", isMatched2);
Console.WriteLine("isMatched3={0}", isMatched3);
string text2 = "\\n good day!";
string pattern4 = "^\\\\n.+$";
bool isMatched4 = false;
isMatched4 = Regex.IsMatch(text2, pattern4);//true
Console.WriteLine("isMatched4={0}", isMatched4);
Console.WriteLine("Press any key to end...");
Console.ReadKey();
}
}
}
运行结果如下所示：
所以可以看到，实际上在C#中，字符串中的换行符”\n”，和正则表达式字符串中的”\n”、”\n”、”\\n”都是匹配的。
而C#字符串”\n”，用正则表达式字符串”\\n”，来进行匹配是成功的。
Original: https://www.cnblogs.com/OpenCoder/p/13713964.html
Author: PowerCoder
Title: C#中换行符n正则表达式测试
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