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  1. #include<iostream>
  2. #include <regex>
  3.  
  4. void DescriptionRegexError(const std::regex_error& e);
  5.  
  6. int main(int argc, char **argv)
  7. {
  8.   (void)argc; (void)argv;
  9.  
  10.  
  11.   try {
  12.       std::regex nameRegex("^[a-zA-Z][[:word:]]+");
  13.       try {
  14.         const auto r = std::regex_match("someDefaultName", nameRegex);
  15.       }
  16.       catch (const std::regex_error& e) {
  17.       	std::cout<<"invalid: const auto r = std::regex_match(\"someDefaultName\", nameRegex);\n";
  18.         DescriptionRegexError(e);
  19.   }
  20.  
  21.   } 
  22.   catch (const std::regex_error& e) {
  23.   	std::cout<<"invalid: std::regex nameRegex(\"^[a-zA-Z][[:word:]]+\");\n";
  24.   	DescriptionRegexError(e);
  25.   }
  26.  
  27.   std::cout<<"-----------------------\n";
  28. }
  29.  
  30. void DescriptionRegexError(const std::regex_error& e)
  31. {
  32. 	  //std::cout << "regex_error caught: " << e.what() << '\n';
  33.       //std::cout<< e.code() << '\n';
  34.  
  35.           if(e.code()==std::regex_constants::error_collate)
  36.              std::cout << "the expression contains an invalid collating element name\n";   
  37.           else if(e.code()==std::regex_constants::error_ctype)
  38.              std::cout << "the expression contains an invalid character class name\n";
  39.           else if(e.code()==std::regex_constants::error_escape)
  40.              std::cout << "the expression contains an invalid escaped character or a trailing escape\n";
  41.           else if(e.code()==std::regex_constants::error_backref)
  42.              std::cout << "the expression contains an invalid back reference\n";
  43.           else if(e.code()==std::regex_constants::error_brack)
  44.              std::cout << "the expression contains mismatched square brackets ('[' and ']')\n";
  45.           else if(e.code()==std::regex_constants::error_paren)
  46.              std::cout << "the expression contains mismatched parentheses ('(' and ')')\n";
  47.           else if(e.code()==std::regex_constants::error_brace)
  48.              std::cout << "the expression contains mismatched curly braces ('{' and '}')\n";
  49.           else if(e.code()==std::regex_constants::error_badbrace)
  50.              std::cout << "the expression contains an invalid range in a {} expression\n";
  51.           else if(e.code()==std::regex_constants::error_space)
  52.              std::cout << "there was not enough memory to convert the expression into a finite state machine\n";
  53.           else if(e.code()==std::regex_constants::error_badrepeat)
  54.              std::cout << "one of *?+{ was not preceded by a valid regular expression\n";
  55.           else if(e.code()==std::regex_constants::error_complexity)
  56.              std::cout << "the complexity of an attempted match exceeded a predefined level\n";
  57.           else if(e.code()==std::regex_constants::error_stack)
  58.              std::cout << "there was not enough memory to perform a match\n";
  59.  
  60. #ifdef _MSC_VER  //microsoft specific
  61.           else if(e.code()==std::regex_constants::error_parse)
  62.              std::cout << "error_parse\n";
  63.           else if(e.code()==std::regex_constants::error_syntax)
  64.              std::cout << "error_syntax\n";
  65. #endif
  66. }
  67.  
  68.  
  69.  
  70.  
Success #stdin #stdout 0s 3468KB
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stdin
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Standard input is empty
stdout
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invalid: std::regex nameRegex("^[a-zA-Z][[:word:]]+");
the expression contains mismatched square brackets ('[' and ']')
-----------------------
https://ideone.com/zlcpkO
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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