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  1. #include <iostream>
  2. #include <cstdio>
  3. #include <cstring>
  4.  
  5. using namespace std;
  6.  
  7. int main()
  8. {
  9.     const char* beforePrefix = "asdfasdfasdfasdf";
  10.     const char* prefix = "<!doctortype html";
  11.     const char* suffix = ".html>";
  12.     const char* postSuffix = "asdasdasd";
  13.  
  14.     unsigned size = 1024;
  15.     char buf[size];
  16.     sprintf(buf, "%s%sTHE STRING YOU WANT TO GET%s%s", beforePrefix, prefix, suffix, postSuffix);
  17.  
  18.     cout << "Before: " << buf << endl;
  19.  
  20.     const char* firstOccurenceOfPrefixPtr = strstr(buf, prefix);
  21.     const char* firstOccurenceOfSuffixPtr = strstr(buf, suffix);
  22.  
  23.     if (firstOccurenceOfPrefixPtr && firstOccurenceOfSuffixPtr)
  24.     {
  25.         unsigned textLen = (unsigned)(firstOccurenceOfSuffixPtr - firstOccurenceOfPrefixPtr - strlen(prefix));
  26.         char newBuf[size];
  27.         strncpy(newBuf, firstOccurenceOfPrefixPtr + strlen(prefix), textLen);
  28.         newBuf[textLen] = 0;
  29.  
  30.         cout << "After: " << newBuf << endl;
  31.     }
  32.  
  33.     return 0;
  34. }
Success #stdin #stdout 0s 2896KB
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stdin
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Standard input is empty
stdout
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Before: asdfasdfasdfasdf<!doctortype htmlTHE STRING YOU WANT TO GET.html>asdasdasd
After: THE STRING YOU WANT TO GET
https://ideone.com/ZgwLtE
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
secret

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