C++ 代码库

去掉字符串的首尾空格

 void trim(string &s)
 {
  
     if( !s.empty() )
     {
         s.erase(0,s.find_first_not_of(" "));
         s.erase(s.find_last_not_of(" ") + 1);
     }
 
 }

详细参考：https://www.cnblogs.com/Shirlies/p/4666744.html

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匹配QQ号

std::regex qq_reg("[1-9]\\d{4,11}");
bool ret = std::regex_match(qq, qq_reg);
std::cout << (ret ? "valid" : "invalid") << std::endl;

详细参考：https://www.cnblogs.com/coolcpp/p/cpp-regex.html

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