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  1. #include <iostream>
  2. #include <string>
  3. #include <regex>
  4.  
  5. using namespace std;
  6.  
  7. int main()
  8. {
  9.   cout << regex_replace("123", regex("(?=(2))(?=9*0)|2"), "<$1>") << '\n';
  10.   cout << regex_replace("123", regex("(?=(2))(?=9*0)|\\d"), "<$1>") << '\n';
  11.   cout << regex_replace("123", regex("(?=(2))(?=9*0)|."), "<$1>") << '\n';
  12.   cout << '\n';
  13.   cout << regex_replace("123", regex("(?=(1))(?=(2))(?=(3))(?=9*0)|(.)"), "<$4>: <$1><$2><$3>\n") << '\n';
  14.   cout << regex_replace("123", regex("(?=(1))(?=(2))(?=(3))(?=0)|(.)"), "<$4>: <$1><$2><$3>\n") << '\n';
  15.   return 0;
  16. }
  17.  
Success #stdin #stdout 0s 3548KB
comments (?)
stdin
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Standard input is empty
stdout
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1<2>3
<><2><>
<><2><>

<1>: <1><><>
<2>: <><><>
<3>: <><><>

<1>: <1><><>
<2>: <><><>
<3>: <><><>
https://ideone.com/JY1c5Q
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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