std::string result;
auto iter = std::sregex_iterator(input.begin(), input.end(), pattern);
auto end = std::sregex_iterator();
size_t lastPos = 0;
for (; iter != end; ++iter) {
const std::smatch& match = *iter;
result.append(input, lastPos, match.position() - lastPos);
// Convert hexadecimal codepoint to integer
int codepoint = std::stoi(match[1].str(), nullptr, 16);
// Append the Unicode character to the result string
result.push_back(static_cast<char>(codepoint));
// Update last position
lastPos = match.position() + match.length();
}
// Append the rest of the input string
result.append(input, lastPos, input.length() - lastPos);
return result;
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}