Databases
StackOverflow2013
Postsdbo
POstd::regex_replace gives me unexpected result
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POstd::regex_replace gives me unexpected result
    primarykey
    data
    text
    <p>I'm using <code>std::regex_replace</code> in a C++ Windows project (Visual Studio 2010). The code looks like this:</p> <pre><code>std::string str("http://www.wikipedia.org/"); std::regex fromRegex("http://([^@:/]+\\.)?wik(ipedia|imedia)\\.org/", std::regex_constants::icase); std::string fmt("https://$1wik$2.org/"); std::string result = std::regex_replace(str, fromRegex, fmt); </code></pre> <p>I would expect <code>result</code> to be <code>"https://www.wikipedia.org/"</code>, but I get <code>"https://www.wikipedia.wikipedia.org/"</code>.</p> <p>A quick check with <code>sed</code> gives me the expected result</p> <pre><code>$ cat &gt; test.txt http://www.wikipedia.org/ $ sed 's/http:\/\/([^@:\/]+\.)?wik(ipedia|imedia)\.org\//https:\/\/$1wik$2.org\//' test.txt http://www.wikipedia.org/ </code></pre> <p>I don't get where the difference comes from. I checked the flags that can be used with <code>std::regex_replace</code>, I didn't see one that would help in this case.</p> <p><strong>Update</strong></p> <p>These variants work fine:</p> <pre><code>std::regex fromRegex("http://([^@:/]+\\.)wik(ipedia|imedia)\\.org/", std::regex_constants::icase); std::regex fromRegex("http://((?:[^@:/]+\\.)?)wik(ipedia|imedia)\\.org/", std::regex_constants::icase); std::regex fromRegex("http://([a-z]+\\.)?wik(ipedia|imedia)\\.org/", std::regex_constants::icase); std::regex fromRegex("http://([^a]+\\.)?wik(ipedia|imedia)\\.org/", std::regex_constants::icase); </code></pre> <p>bu not these:</p> <pre><code>std::regex fromRegex("http://([^1-9]+\\.)?wik(ipedia|imedia)\\.org/", std::regex_constants::icase); std::regex fromRegex("http://([^@]+\\.)?wik(ipedia|imedia)\\.org/", std::regex_constants::icase); std::regex fromRegex("http://([^:]+\\.)?wik(ipedia|imedia)\\.org/", std::regex_constants::icase); </code></pre> <p>It makes no sense to me...</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USJulien
    1. USJulien
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POstd::regex_replace gives me unexpected result
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POstd::regex_replace gives me unexpected result
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhat compiler are you using? If it's GCC give up: `<regex>` *is not implemented*. Use boost instead.
      singulars
      1. POstd::regex_replace gives me unexpected result
      1. USR. Martinho Fernandes
    2. COI wasn't aware that any compiler had regex support yet. Is this a recent update to a compiler?
      singulars
      1. POstd::regex_replace gives me unexpected result
      1. USJoseph Mansfield
    3. CO@sftrabbit MSVC's STL has had a functional regex implementation since version 2008, and LLVM/Clang's libc++ has a complete regex implementation as well.
      singulars
      1. POstd::regex_replace gives me unexpected result
      1. USrubenvb
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload