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  1. #include <iostream>
  2. #include <cstring>
  3. using namespace std;
  4.  
  5. char* find_markers(char* haystack, const char* marker_opening, const char* marker_closing, char* &contents, char* &after)
  6. {
  7.     // ...<marker1>... ... ...<marker2>...
  8.     //    ^return  ^contents  ^NULL    ^after
  9.  
  10.     char* marker_begin = strstr(haystack, marker_opening);
  11.     if(marker_begin)
  12.     {
  13.         contents = &marker_begin[strlen(marker_opening)];
  14.  
  15.         char* marker_end = strstr(contents, marker_closing);
  16.         if(marker_end)
  17.         {
  18.             haystack[marker_end-haystack] = NULL;
  19.             after = &marker_end[strlen(marker_closing)];
  20.             return marker_begin;
  21.         }
  22.         return NULL;
  23.     }
  24.     return NULL;
  25. }
  26.  
  27. int main()
  28. {
  29.  
  30.     char text[] = "            <tag>contents1</tag>       <tag><tag>           ";
  31.     char* cursor = text;
  32.     char* contents = NULL;
  33.  
  34.     while(true)
  35.     {
  36.         if(!find_markers(cursor, "<tag>", "</tag>", contents, cursor)) break;
  37.         cout << contents << "\n";
  38.     }
  39.  
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0s 4960KB
comments (?)
stdin 
Standard input is empty
stdout 
contents1
https://ideone.com/RNurNc
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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