符下两ows表研究室的火热,当晨在“@”虽然并非C#正则表达式的“成员”,但是它经常与C#正则表达式出双入对。“@”表示,跟在它后面的字符串是个“逐字字符串”,不是很好理解,举个例子,以下两个声明是等效的:
. 除换行符/n外的任意字符
string i = "Live for nothing,
die for something";
Regex r1 = new Regex("^Live for nothing,die for something$");
//r1.IsMatch(i) true
Regex r2 = new Regex("^Live for nothing,die for some$");
//r2.IsMatch(i) false
Regex r3 = new Regex("^Live for nothing,die for some");
//r3.IsMatch(i) true
string i = @"Live for nothing,
die for something";//多行
Regex r1 = new Regex("^Live for nothing,die for something$");
Console.Wr
ITeLine("r1 match count:" + r1.Matches(i).Count);//0
Regex r2 = new Regex("^Live for nothing,die for something$", RegexOptions.Multiline);
Console.WriteLine("r2 match count:" + r2.Matches(i).Count);//0
Regex r3 = new Regex("^Live for nothing,/r/ndie for something$");
Console.WriteLine("r3 match count:" + r3.Matches(i).Count);//1
Regex r4 = new Regex("^Live for nothing,$");
Console.WriteLine("r4 match count:" + r4.Matches(i).Count);//0
Regex r5 = new Regex("^Live for nothing,$", RegexOptions.Multiline);
Console.WriteLine("r5 match count:" + r5.Matches(i).Count);//0
Regex r6 = new Regex("^Live for nothing,/r/n$");
Console.WriteLine("r6 match count:" + r6.Matches(i).Count);//0
Regex r7 = new Regex("^Live for nothing,/r/n$", RegexOptions.Multiline);
Console.WriteLine("r7 match count:" + r7.Matches(i).Count);//0
Regex r8 = new Regex("^Live for nothing,/r$");
Console.WriteLine("r8 match count:" + r8.Matches(i).Count);//0
Regex r9 = new Regex("^Live for nothing,/r$", RegexOptions.Multiline);
Console.WriteLine("r9 match count:" + r9.Matches(i).Count);//1
Regex r10 = new Regex("^die for something$");
Console.WriteLine("r10 match count:" + r10.Matches(i).Count);//0
Regex r11 = new Regex("^die for something$", RegexOptions.Multiline);
Console.WriteLine("r11 match count:" + r11.Matches(i).Count);//1
Regex r12 = new Regex("^");
Console.WriteLine("r12 match count:" + r12.Matches(i).Count);//1
Regex r13 = new Regex("$");
Console.WriteLine("r13 match count:" + r13.Matches(i).Count);//1
Regex r14 = new Regex("^", RegexOptions.Multiline);
Console.WriteLine("r14 match count:" + r14.Matches(i).Count);//2
Regex r15 = new Regex("$", RegexOptions.Multiline);
Console.WriteLine("r15 match count:" + r15.Matches(i).Count);//2
Regex r16 = new Regex("^Live for nothing,/r$/n^die for something$", RegexOptions.Multiline);
Console.WriteLine("r16 match count:" + r16.Matches(i).Count);//1
//对于一个多行字符串,在设置了Multiline选项之后,^和$将出现多次匹配。
string i = "Live for nothing,die for something";
string m = "Live for nothing,die for some thing";
Regex r1 = new Regex(@"/
BThing/b");
Console.WriteLine("r1 match count:" + r1.Matches(i).Count);//0
Regex r2 = new Regex(@"thing/b");
Console.WriteLine("r2 match count:" + r2.Matches(i).Count);//2
Regex r3 = new Regex(@"/bthing/b");
Console.WriteLine("r3 match count:" + r3.Matches(m).Count);//1
Regex r4 = new Regex(@"/bfor something/b");
Console.WriteLine("r4 match count:" + r4.Matches(i).Count);//1
///b通常用于约束一个完整的单词