Re: [Boost-users] Boost.Regex: regex_replace with named captures/groups

Subject: Re: [Boost-users] Boost.Regex: regex_replace with named captures/groups
From: John Maddock (boost.regex_at_[hidden])
Date: 2012-01-31 03:41:12

> does boost's regex_replace not recognize named captures/groups or did I 
> something wrong?

Yes it does, but remember that the C++ compiler gobbles up the \'s before 
regex gets to se those strings, so use \\ everywhere and you should be fine.

HTH, John.

> std::string date = "2012/01/30";
> std::string replace = "\5\g{separator}\4\g{separator}\1\2";   // should be 
> => 30/01/2012
> boost::regex 
> rx("^(19|20)(\d\d)(?<separator>[/.])(0[1-9]|1[012])\g{separator}(0[1-9]|[12][0-9]|3[01])$");
>
> std::string replaced = boost::regex_replace(date, rx, replace);
>
> The content in "replaced" is now "30\g{separator}01\g{separator}2012"
>
> Thanks in advance
>
> Best Regards
> NoRulez
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