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@ellert : thanks for the PR, on which platform / compiler are you getting this problem? Looking at `regex_replace` signatures I see:

```
template <class traits, class charT>
  basic_string<charT> regex_replace (const charT* s,
          const basic_regex<charT,traits>& rgx,
          const charT* fmt,
          regex_constants::match_flag_type flags = regex_constants::match_default);
```

this should much well a `C string`.

Secondly, instead of creating a temporary `std::string("/")` could you please do
```
static const std::string slash( "/" );
path_rule.m_path_prefix = std::regex_replace( path_rule.m_path_prefix, std::regex("//"), slash );
```

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