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  1. #include <regex>
  2. #include <string>
  3. #include <iostream>
  4.  
  5. int main()
  6. {
  7. 	std::string line = "abcde";
  8.     {
  9.     	const std::string RX_ION_TYPE("ab?|ab?(?:cd|dc)");
  10.  
  11.     	const auto regexType = std::regex::ECMAScript;
  12.  
  13.     	std::regex rx_ionType;
  14.  
  15.     	rx_ionType.assign(
  16.     		"(" + RX_ION_TYPE + ")"
  17.     		, regexType);
  18.  
  19.     	std::smatch match;
  20.  
  21.     	if (std::regex_search(line, match, rx_ionType))
  22.     	{
  23.     		for (int i = 0; i < match.size(); i++)
  24.     		{
  25.     			std::cout << "|" << match.str(i) << "|\n";
  26.     		}
  27.  
  28.     	}
  29.     	else
  30.     	{
  31.     		std::cout << "No match.\n";
  32.     	}
  33.     }
  34.  
  35.     {
  36.     	const std::string RX_ION_TYPE("ab?(?:cd|dc)|ab?");
  37.  
  38.     	const auto regexType = std::regex::ECMAScript;
  39.  
  40.     	std::regex rx_ionType;
  41.  
  42.     	rx_ionType.assign(
  43.     		"(" + RX_ION_TYPE + ")"
  44.     		, regexType);
  45.  
  46.     	std::smatch match;
  47.  
  48.     	if (std::regex_search(line, match, rx_ionType))
  49.     	{
  50.     		for (int i = 0; i < match.size(); i++)
  51.     		{
  52.     			std::cout << "|" << match.str(i) << "|\n";
  53.     		}
  54.  
  55.     	}
  56.     	else
  57.     	{
  58.     		std::cout << "No match.\n";
  59.     	}
  60. 	}
  61. 	{
  62. 		const std::string RX_ION_TYPE("ab?(?:cd|dc)?");
  63.  
  64. 		const auto regexType = std::regex::ECMAScript;
  65.  
  66. 		std::regex rx_ionType;
  67.  
  68. 		rx_ionType.assign(
  69. 			"(" + RX_ION_TYPE + ")"
  70. 			, regexType);
  71.  
  72. 		std::smatch match;
  73.  
  74. 		if (std::regex_search(line, match, rx_ionType))
  75. 		{
  76. 			for (int i = 0; i < match.size(); i++)
  77. 			{
  78. 				std::cout << "|" << match.str(i) << "|\n";
  79. 			}
  80.  
  81. 		}
  82. 		else
  83. 		{
  84. 			std::cout << "No match.\n";
  85. 		}
  86. 	}
  87.  
  88. 	return 0;
  89. }
  90.  
Success #stdin #stdout 0s 3544KB
comments (?)
stdin
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Standard input is empty
stdout
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|ab|
|ab|
|abcd|
|abcd|
|abcd|
|abcd|
https://ideone.com/UgydTD
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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