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  1. #include <iostream>
  2. #include <string>
  3. #include <regex>
  4. using namespace std;
  5.  
  6. int main() {
  7. 	string userInput = "=";
  8. 	regex infix(R"([()\d+/*-]+)");
  9. 	if(regex_match(userInput,infix)){
  10. 	    cout<<"Valid expression!\n";
  11. 	} else {
  12. 		cout<<"Error: Not a valid infix expression!\n";
  13. 	}
  14. 	return 0;
  15. }
Success #stdin #stdout 0s 15336KB
comments (?)
stdin 
=
stdout 
Error: Not a valid infix expression!
https://ideone.com/6vmW4c
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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