csharp RegExp c＃的正则表达式

Posted 2021-05-12

string test ="Abcccccc";
Regex reg =newRegex("abc");
Console.WriteLine(reg.IsMatch(test));//false
Regex reg1 =newRegex("abc",RegexOptions.IgnoreCase);//不区分大小写
Console.WriteLine(reg1.IsMatch(test));//true


string test ="vvv123===456vvv";
Regex reg =newRegex("\\d+");//  123 从左到右 匹配连续数字
Console.WriteLine(reg.Match(test));
//RightToLeft  从右到左 匹配连续数字
Regex reg1 =newRegex("\\d+",RegexOptions.RightToLeft);
Console.WriteLine(reg1.Match(test));// 456 从右到左 匹配连续数字


//MultiLine多行匹配
StringBuilder input =newStringBuilder();
input.AppendLine("A bbbb A");
input.AppendLine("C bbbb C");
string pattern =@"^\w";
Console.WriteLine(input.ToString());
MatchCollection matchCol =Regex.Matches(input.ToString(), pattern,RegexOptions.Multiline);
foreach(Match item in matchCol)
{
    Console.WriteLine("结果：{0}", item.Value);
}

//Replace()
string name3 ="xiaolizi";
var name4 =Regex.Replace(name3,@"[a-z]","123");
Console.WriteLine(name4);

//Match()
string name =@"go ogle is a VERY good 20 company for
everybody!";
var bb =Regex.Match(name,@"goog?");// []里面的空格也是算的，[]里面的元素是或的意思，匹配里面的字符串直至匹配不成功为止
Console.WriteLine(bb);
Console.ReadKey();


//IsMatch()
string str1 ="abcbbbbbbbb";
string str2 =@"^abc";
Console.WriteLine(Regex.IsMatch(str1,str2));//静态的重载方法