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  1. #include <string>
  2. #include <iostream>
  3. #include <regex>
  4.  
  5. void replaceSystemEnviromentTokens(std::string& var)
  6. {
  7. 	static std::string tokenOpening = "\\[\\[";
  8. 	static std::string tokenClosure = "\\]\\]";
  9. 	auto getEnvVal = [](const std::string& var) {
  10. 		char* val = getenv(var.c_str());
  11. 		return std::string(val ? val : "");
  12. 	};
  13.  
  14. 	std::regex re(tokenOpening + "(\\S+)" + tokenClosure);
  15. 	std::smatch m;
  16. 	while (std::regex_search(var, m, re)) {
  17. 		auto value = getEnvVal(m.str(1));
  18. 		if (!value.empty()) {
  19. 			std::regex re(tokenOpening + m.str(1) + tokenClosure);
  20. 			var = regex_replace(var, re, value);
  21. 		}
  22. 	}
  23. }
  24.  
  25. int main(int argc, char** argv) 
  26. {
  27. 	putenv(R"(VULKAN_SDK=C:\VulkanSDK\1.2.148.1)");
  28. 	std::string test = "this should be converted: [[VULKAN_SDK]] this should not be converted: VULKAN_SDK]] this: [[VULKAN_SDK]]";
  29. 	replaceSystemEnviromentTokens(test);
  30. 	std::cout << test << std::endl;
  31.  
  32. 	test = "nothing to convert here";
  33. 	replaceSystemEnviromentTokens(test);
  34. 	std::cout << test << std::endl;
  35.  
  36. 	test = "something to convert here: [[PATH]]";
  37. 	replaceSystemEnviromentTokens(test);
  38. 	std::cout << test << std::endl;
  39. }
Success #stdin #stdout 0s 4996KB
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Standard input is empty
stdout
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this should be converted: C:\VulkanSDK\1.2.148.1 this should not be converted: VULKAN_SDK]] this: C:\VulkanSDK\1.2.148.1
nothing to convert here
something to convert here: /usr/local/bin:/usr/bin:/bin
https://ideone.com/BoG8dB
BROKEN CODE... replaceSystemEnviromentTokens with regex
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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