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  1. #include <iostream>
  2. #include <string>
  3. #include <regex>
  4. using namespace std;
  5.  
  6. int main() {
  7.     string input;
  8.     cout << "Enter string to calculate: ";
  9.     cin >> input;
  10.  
  11.     cmatch logElements;
  12.     regex logRegex("(log)|(ln)|(lg)");
  13.     if (regex_search(input.c_str(), logElements, logRegex)){
  14.         for (int i = 0; i < logElements.size(); i++){
  15.             cout << logElements[i] << endl;
  16.         }
  17.     }
  18.     return 0;
  19. }
Success #stdin #stdout 0s 15336KB
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stdin
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Standard input is empty
stdout
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Enter string to calculate:
https://ideone.com/OXlOW3
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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