static void Main(string[] args)
{

   Worker.TwoNumberHandleMethodDelegate method = delegate(int a, int b)
  {
   return a + b;
  };
   Worker worker = new Worker();
   int result = worker.HandleTwoNumber(10, 10,method);

   Console.WriteLine(String.Format("Result:{0}", result));

   Console.ReadLine();
}

 static void Main(string[] args)
  {
   Worker worker = new Worker();
   int result = worker.HandleTwoNumber(10, 10, delegate (int a, int b)
   {
    return a + b;
   });

   Console.WriteLine(String.Format("Result:{0}", result));

   Console.ReadLine();
  }

static void Main(string[] args)
  {

   Worker.TwoNumberHandleMethodDelegate method = delegate(int a, int b)
  {
   return a + b;
  };
}

static void Main(string[] args)
  {

   Worker.TwoNumberHandleMethodDelegate method = (a, b)=>
  {
   return a + b;
  };
}

 static void Main(string[] args)
  {
   Worker worker = new Worker();
   int result = worker.HandleTwoNumber(10, 10, (a, b) =>
   {
    return a + b;
   });

   Console.WriteLine(String.Format("Result:{0}", result));

   Console.ReadLine();
  }

private void A1()
    {
      Console.WriteLine("....");
    }
//Lambda
()=>{Console.WriteLine("....");};
//如果方法体代码只有一句，如上还可省去方法体大括号
()=>Console.WriteLine("....");

private string A2(int a, int b)
    {
      return String.Format("{0}+{1}={2}", a, b, a + b);
    }
    //如上示例可简化为
    (a,b)=>{return String.Format("{0}+{1}={2}", a, b, a + b);}
    //因为方法体只有一句，可进一步简化
    (a,b)=> String.Format("{0}+{1}={2}", a, b, a + b);
    //此时注意return应该去掉，C#编译器自动识别=>做返回值

private string A3(int a)
    {
      return String.Format("{0}", a);
    }
    //上面示例可简化为
    (a)=>String.Format("{0}", a);
    //如果参数列表只有一个参数，参数列表的()可以去掉，上面进一步简化为
    a=>String.Format("{0}", a);

目录

• 介绍
• 1. C++ 中的正则表达式 (Regex)
• 1.1 范围规范
• 1.2 重复模式
• 2. C++正则表达式的例子
• 3. C++正则表达式中使用的函数模板
• 3.1 regex_match()
• 3.2 regex_search()
• 3.3 regex_replace()
• 4.C++输入验证
• 5.总结

char regex_filename[] = “[a-zA-Z_] [a-zA-Z_0-9]*\\.[a-zA-Z0-9]+”;

#include <iostream>
#include <string>
#include <regex>
using namespace std;
 
int main () {
 
   if (regex_match ("softwareTesting", regex("(soft)(.*)") ))
      cout << "string:literal => matched\n";
 
   const char mystr[] = "SoftwareTestingHelp";
   string str ("software");
   regex str_expr ("(soft)(.*)");
 
   if (regex_match (str,str_expr))
      cout << "string:object => matched\n";
 
   if ( regex_match ( str.begin(), str.end(), str_expr ) )
      cout << "string:range(begin-end)=> matched\n";
 
   cmatch cm;  //匹配的词语检索出来
   regex_match (mystr,cm,str_expr);
    
   smatch sm;
   regex_match (str,sm,str_expr);
    
   regex_match ( str.cbegin(), str.cend(), sm, str_expr);
   cout << "String:range, size:" << sm.size() << " matches\n";
 
   
   regex_match ( mystr, cm, str_expr, regex_constants::match_default );
 
   cout << "the matches are: ";
   for (unsigned i=0; i<sm.size(); ++i) {
      cout << "[" << sm[i] << "] ";
   }
 
   cout << endl;
 
   return 0;
}

#include <iostream> 
#include <regex> 
#include<string.h> 
using namespace std; 
   
int main() 
{ 
    //string to be searched
    string mystr = "She sells_sea shells in the sea shore"; 
   
    // regex expression for pattern to be searched 
    regex regexp("s[a-z_]+"); 
   
    // flag type for determining the matching behavior (in this case on string objects)
     smatch m; 
   
    // regex_search that searches pattern regexp in the string mystr  
    regex_search(mystr, m, regexp); 
  
    cout<<"String that matches the pattern:"<<endl;
    for (auto x : m) 
        cout << x << " "; 
    return 0; 
}

#include <iostream> 
#include <string> 
#include <regex> 
#include <iterator> 
using namespace std; 
   
int main() 
{  
    string mystr = "This is software testing Help portal \n"; 
     
    cout<<"Input string: "<<mystr<<endl;
       
    // regex to match string beginning with ''p'' 
    regex regexp("p[a-zA-z]+"); 
    cout<<"Replace the word ''portal'' with word ''website'' : "; 
    // regex_replace() for replacing the match with the word ''website''  
    cout << regex_replace(mystr, regexp, "website"); 
     
    string result; 
       
    cout<<"Replace the word ''website'' back to ''portal'': ";
    // regex_replace( ) for replacing the match back with ''portal'' 
    regex_replace(back_inserter(result), mystr.begin(), mystr.end(), 
                  regexp,  "portal"); 
   
    cout << result; 
   
    return 0; 
}

#include <iostream>
#include <regex>
#include <string>
using namespace std;
  
int main()
{
    string input;
    regex integer_expr("(\\+|-)?[[:digit:]]+");
    //As long as the input is correct ask for another number
    while(true)
    {
        cout<<"Enter the input: ";
        cin>>input;
        if(!cin) break;
        //Exit when the user inputs q
        if(input=="q")
            break;
        if(regex_match(input,integer_expr))
            cout<<"Input is an integer"<<endl;
        else
        {cout<<"Invalid input : Not an integer"<<endl;}
    }
}

• C++实现LeetCode(10.正则表达式匹配)
• C++使用正则表达式的详细教程
• C++中使用正则匹配问题

.myclass{
backgroud-color:black !important;
}

.A{
 font-size:12px !important;
}
.A{
 font-size:14px;   //不会生效
}

.A{
 font-size:14px !important; //生效
}

<html>
<head>
<style>
.father{
font-size:12px !important;
}
.child{
font-size:14px;
}
</style>
<body>
<div>
 <div>I am child </div>
</div>
</body>
</html>