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  1. #include <iostream>
  2. #include <string>
  3. #include <regex>
  4.  
  5. using namespace std;
  6.  
  7. int main()
  8. {
  9. cout << regex_replace("00211", regex("^0|1$"), "");
  10. return 0;
  11. }
Success #stdin #stdout 0s 4496KB
stdin
Standard input is empty
stdout
021