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  1. #include <iostream>
  2. #include <regex>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	std::vector<std::string> strings;
  7. 	strings.push_back("1.200e+12");
  8. 	strings.push_back("1.0200e+12");
  9. 	strings.push_back("1.0000e+12");
  10. 	strings.push_back("1.0e+12");
  11. 	strings.push_back("1.e+12");
  12. 	strings.push_back("100e");
  13. 	strings.push_back("100e+12");
  14. 	std::regex reg(R"((\d*)(?:(?=[.]0*e)[.]0*|(?![.]0+e)([.][0-9]*?)0*)(e(?:[+]\d+)?))");
  15. 	for (size_t k = 0; k < strings.size(); k++)
  16. 	{
  17. 		std::cout << "Next string: " << strings[k] << std::endl;
  18. 		std::cout << "Replace result: " 
  19. 		             << std::regex_replace(strings[k], reg, "$1$2$3") << std::endl;
  20. 	}
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 3504KB
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stdin
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Standard input is empty
stdout
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Next string: 1.200e+12
Replace result: 1.2e+12
Next string: 1.0200e+12
Replace result: 1.02e+12
Next string: 1.0000e+12
Replace result: 1e+12
Next string: 1.0e+12
Replace result: 1e+12
Next string: 1.e+12
Replace result: 1e+12
Next string: 100e
Replace result: 100e
Next string: 100e+12
Replace result: 100e+12
https://ideone.com/eDg8ga
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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