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  1. #include <iostream>
  2. #include <regex>
  3. #include <vector>
  4.  
  5. int main() {
  6. 	std::regex rx(R"(^([+-]?(?:[[:d:]]+\.?|[[:d:]]*\.[[:d:]]+))(?:[Ee][+-]?[[:d:]]+)?$)");
  7. 	std::vector<std::string> v({{
  8. 		"1", "0", "10",
  9. 		"1000.1", "+1",
  10. 		"+10", "-10", "1.",
  11. 		".1", "1.1", "+1.",
  12. 		"-1.", "+.1", "-.1",
  13. 		"009", "+009", "-009",
  14. 		"-01e0", "+01E0", "+1e-1",
  15. 		"+1e+1", "+1.e1", "1E1",
  16. 		"1E+1", "0.001e-12", "0.111111111111111", 
  17. 		".", "1a", "++1",
  18. 		"+-1", "+", "-.",
  19. 		"-", "--1.", "1.e.1",
  20. 		"1e.1", "0+.e0"
  21. 	}});
  22. 	for (int i = 0; i < v.size(); ++i) {
  23. 		std::cout << (std::regex_match(v[i], rx) ? "matched: " : "not matched: ")
  24. 			<< v[i] << std::endl; 
  25. 	}
  26.  
  27.     // std::regex rx2(R"(^[[:alpha:]][[:alnum:]]*$)");
  28.     // std::string s("ыwwe3");
  29.     // if (std::regex_match(s, rx2)) {
  30.     //     std::cout << "var object matched\n";
  31.     // }
  32. 	return 0;
  33. }
Success #stdin #stdout 0s 15336KB
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stdin
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Standard input is empty
stdout
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matched: 1
matched: 0
matched: 10
matched: 1000.1
matched: +1
matched: +10
matched: -10
matched: 1.
matched: .1
matched: 1.1
matched: +1.
matched: -1.
matched: +.1
matched: -.1
matched: 009
matched: +009
matched: -009
matched: -01e0
matched: +01E0
matched: +1e-1
matched: +1e+1
matched: +1.e1
matched: 1E1
matched: 1E+1
matched: 0.001e-12
matched: 0.111111111111111
not matched: .
not matched: 1a
not matched: ++1
not matched: +-1
not matched: +
not matched: -.
not matched: -
not matched: --1.
not matched: 1.e.1
not matched: 1e.1
not matched: 0+.e0
https://ideone.com/ooF8sG
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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