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  1. #include <regex>
  2. #include <string>
  3. #include <iostream>
  4. using namespace std;
  5.  
  6. int main()
  7. {
  8. 	string regx = R"((\d+\.\d+\.)\d+\.\d+)";
  9. 	string input = "192.168.1.1";
  10. 	smatch matches;
  11. 	    if (regex_search(input, matches, regex(regx)))
  12. 	    {
  13. 	        cout<<matches[1]<<"."<<endl;
  14. 	    }
  15. 	return 0;
  16. }
Success #stdin #stdout 0s 3552KB
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Standard input is empty
stdout
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192.168..
https://ideone.com/CjsU42
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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