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substr is extracting only characters after "Traceback" appearance, until the next matching "Traceback" and "SystemError".
=={{header|C++}}==
<syntaxhighlight lang="c++">
#include <algorithm>
#include <cstdint>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
const std::string PARAGRAPH_SEPARATOR = "\n\n";
int main() {
std::ifstream file;
file.open("../Traceback.txt");
std::stringstream stream;
stream << file.rdbuf();
std::string file_contents = stream.str();
std::vector<std::string> paragraphs;
uint64_t start;
uint64_t end = 0;
while ( ( start = file_contents.find_first_not_of(PARAGRAPH_SEPARATOR, end) ) != std::string::npos ) {
end = file_contents.find(PARAGRAPH_SEPARATOR, start);
paragraphs.emplace_back(file_contents.substr(start, end - start));
}
for ( const std::string& paragraph : paragraphs ) {
if ( paragraph.find("SystemError") != std::string::npos ) {
int32_t index = paragraph.find("Traceback (most recent call last):");
if ( index >= 0 ) {
std::cout << paragraph.substr(index) << std::endl;
std::cout << "----------------" << std::endl;
}
}
}
}
</syntaxhighlight>
{{ out }}
<pre>
Output as required by task.
</pre>
=={{header|J}}==
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