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  1. #include <regex>
  2. #include <string>
  3. #include <iostream>
  4. using namespace std;
  5.  
  6. int main()
  7. {
  8. 	std::string s("ccc\r\naaa\r\ngggg");
  9. 	std::regex ee(R"((^|\r?\n)(?:aaa|bbb)(?=\r?\n|$))");
  10. 	std::string newtext = std::regex_replace( s, ee, "$1" );
  11.     std::cout << newtext << std::endl;
  12.  
  13. }
Success #stdin #stdout 0s 3544KB
comments (?)
stdin 
Standard input is empty
stdout 
ccc

gggg
https://ideone.com/Qh1Ch9
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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