无法使用PCRE表达式的C ++正则表达式？

Question

I have the following code:

  include <regex>
  include <string>
  TCHAR basePath[MAX_PATH];
  GetCurrentDirectory(MAX_PATH, basePath);

  wstring test(&basePath[0]); //convert to wstring
  string test2(test.begin(), test.end()); //and convert to string.

  std::regex rBase("(.*my-dir)");
  std::smatch sm;
  std::regex_match(test2, sm, rBase);

However, sm always returns empty

Basically if I have the following directory structure:

E:\foo\bar\baz\my-dir\post1\dir2

I need to return

"E:\foo\bar\baz\my-dir"

The regex seems to work if I run it though, say, python or javascript, but not here in C++

What am I missing or what are some alternatives?

Thanks

Answer 1

std::regex_match checks whether the whole string matches the regex, not just any part of it.

Use std::regex_search instead of std::regex_match or use a regex that matches the whole string, such as "(.*my-dir).*" , and extract the submatch with sm[1].str() .