Microsoft C++ exception: std::regex_error at memory location

Question

I wrote the following code for parsing command line arguments, using Visual C++ 2012. These command-line parameters have traditional GNU style (--option).

void parseCmdLines(int argc, wchar_t* argv[]) {
  for (auto i = 1; i < argc; ++i) {
    std::wstring arg(argv[i]);
    // I hope it can match the L"--config=../etc/my.conf"
    std::wregex regex(L"--config=(+*)");
    std::wsmatch match;
    std::regex_match(arg, match, regex);

    // TODO: ...
}

Unfortunately, when I run this program, I met an exception. The description of the exception is as follows:

Microsoft C++ exception: std::regex_error at memory location 0x23F090.

How can I solve this problem?

checkout this stackoverflow.com/questions/8359566/regex-to-match-symbols — HeavenHM
– HeavenHM, Commented Jul 7, 2020 at 0:20

Bernhard Barker · Accepted Answer · 2013-08-02 11:05:39Z

5

It's likely that your problem is with +*.

+ means one or more of what appears before it and * means zero or more of what appears before it (since there is a ( before the +, it shouldn't work, since this merely means the start of a group, and for the + before the *, you can't really say "zero or more of one or more").

Did you maybe mean .* (i.e. zero or more of anything) or .+ (i.e. one or more of anything)?

answered Aug 2, 2013 at 11:05

Bernhard Barker

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2 Comments

chee Over a year ago

Thank you for helping me solve this problem. I really remiss. :)

HeavenHM Over a year ago

i solved it using "\\" slash trick const std::regex reg_off_p("\\+[0-9A-F]{2}");

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