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  1. #include <iostream>
  2. #include <regex>
  3. #include <string>
  4. //#include <sstream>
  5. //#include <algorithm>
  6. int main()
  7. {
  8.     std::string input_text = "my text\nbegin foo even 14 spaces and maybe \nnew line(\nsome text only replace foo foo bar foo, keep the rest\n)\nsome more text not replace foo here";
  9.     std::regex re(R"((begin[^(]*)(\([^)]*\)))");
  10.     std::regex rxReplace(R"(\bfoo\b)");
  11.     std::string output_text;
  12.     auto callback = [&](std::string const& m){
  13.         //std::istringstream iss(m);
  14.         std::smatch smtch;
  15.         if (regex_search(m, smtch, re)) {
  16. 			output_text += smtch[1].str();
  17. 			output_text += std::regex_replace(smtch[2].str().c_str(), rxReplace, "abc");
  18.         } else {
  19.         	output_text += m;
  20.         }
  21.     };
  22.  
  23.     std::sregex_token_iterator
  24.         begin(input_text.begin(), input_text.end(), re, {-1,0}),
  25.         end;
  26.     std::for_each(begin,end,callback);
  27.  
  28.     std::cout << output_text;
  29.     return 0;
  30. }
Success #stdin #stdout 0s 3564KB
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stdin
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Standard input is empty
stdout
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my text
begin foo even 14 spaces and maybe 
new line(
some text only replace abc abc bar abc, keep the rest
)
some more text not replace foo here
https://ideone.com/TJsGfH
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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