Wrong error message

Windows Platform, using gcc 11.2 and boost 1.77

With regex [a-e the error message is wrong, referencing unbalanced parenthesis, instead of unmatched [
Error message : Found a closing ) with no corresponding opening parenthesis. The error occurred while parsing the regular expression: '[a-e>>>HERE>>>'. at 4

`#include
#include
#include

int main()
{
std::string s = "Boost Libraries Test";
try
{
// regex contains error : missing ]
boost::regex expr{"[a-e"};
boost::smatch what;
if (boost::regex_search(s, what, expr))
std::cout << "Found !" << '\n';
else
std::cout << "Nothing !" << '\n';
}
catch(boost::regex_error& ex)
{
std::cout << ex.what() << " at " << ex.position() << "\n";
}
}`