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  1. #include <iostream>
  2. #include <regex>
  3.  
  4. bool containsOnlyAllowedSymbols(char const *equation)
  5. {
  6.     std::regex re(R"([^0-9(){}[\]*+-/])");
  7.     return !std::regex_search(equation, re);
  8. }
  9.  
  10. int main()
  11. {
  12.  
  13.     std::cout << containsOnlyAllowedSymbols("(10+20)-200*4") << std::endl;
  14.     std::cout << containsOnlyAllowedSymbols("10+20-{200}abc") << std::endl;
  15.  
  16.     return 0;
  17. }
Success #stdin #stdout 0s 4560KB
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https://ideone.com/wR0yA0
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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