蓝桥ROS机器人之现代C++学习笔记 第 6 章 正则表达式

在ROS1/2中使用boost，例如下述：

引用如下程序：

  

   

    

     

    
    

     

      #include <iostream>
     
    
   

    

     

    
    

     

      #include <string>
     
    
   

    

     

    
    

     

      #include <regex>
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      int main() {
     
    
   

    

     

    
    

     

          std::string fnames[] = {"foo.txt", "bar.txt", "test", "a0.txt", "AAA.txt"};
     
    
   

    

     

    
    

     
    // In C++, `\` will be used as an escape character in the string. 
     
    
   

    

     

    
    

     
    // In order for `\.` to be passed as a regular expression, 
     
    
   

    

     

    
    

     
    // it is necessary to perform second escaping of `\`, thus we have `\\.`
     
    
   

    

     

    
    

     
    std::regex txt_regex("[a-z]+\\.txt");
     
    
   

    

     

    
    

     
    for (const auto &fname: fnames)
     
    
   

    

     

    
    

     

              std::cout << fname << ": " << std::regex_match(fname, txt_regex) << std::endl;
     
    
   

    

     

    
    

     
    
     
    
   

    

     

    
    

     
    std::regex base_regex("([a-z]+)\\.txt");
     
    
   

    

     

    
    

     

          std::smatch base_match;
     
    
   

    

     

    
    

     
    for(const auto &fname: fnames) {
     
    
   

    

     

    
    

     
        if (std::regex_match(fname, base_match, base_regex)) {
     
    
   

    

     

    
    

     
            // the first element of std::smatch matches the entire string
     
    
   

    

     

    
    

     
            // the second element of std::smatch matches the first expression with brackets
     
    
   

    

     

    
    

     
            if (base_match.size() == 2) {
     
    
   

    

     

    
    

     

                      std::string base = base_match[1].str();
     
    
   

    

     

    
    

     

                      std::cout << "sub-match[0]: " << base_match[0].str() << std::endl;
     
    
   

    

     

    
    

     

                      std::cout << fname << " sub-match[1]: " << base << std::endl;
     
    
   

    

     

    
    

     

                  }
     
    
   

    

     

    
    

     

              }
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     
    
     
    
   

    

     

    
    

     
    return 0;
     
    
   

    

     

    
    

     

      }
     
    
  
 

answers.ros.org/question/363788/select-topics-with-search-pattern-regex-in-rosbag2/ 

文章来源: zhangrelay.blog.csdn.net，作者：zhangrelay，版权归原作者所有，如需转载，请联系作者。

原文链接：zhangrelay.blog.csdn.net/article/details/124126231