int main()
{
std::string s = "for a good time, call 867-5309";
std::regex phone_regex("\\d{3}-\\d{4}");
std::smatch phone_match;
if (std::regex_search(s, phone_match, phone_regex)) {
std::string fmt_s = phone_match.format(
"$`" // $` means characters before the match
"[$&]" // $& means the matched characters
"$'"); // $' means characters following the match
std::cout << fmt_s << '\n';
}
}
int main()
{
std::cout<<"test regex simple usage:\n";
std::string email_pattern("(\\w)+(\\.\\w+)*@(\\w)+((\\.\\w+)+)");
try
{
std::regex email_regex(email_pattern);
std::smatch results;
std::string test_email_str = "My email is [email protected]";
if(std::regex_search(test_email_str, results, email_regex))
{
std::cout<<results.str()<<std::endl;
}
}
catch (std::regex_error e)
{
std::cout<<e.what()<<'\t'<<e.code()<<std::endl;
}
std::cout<<"test regex simple usage done.\n"<<std::endl;
std::cout<<"test regex icase:\n";
try
{
std::regex cpp_regex("(\\w)+\\.(cpp|hpp)$", std::regex::icase);
std::vector<std::string> test_filenames = {"regex.cpp", "iostream.h", "template.CPP", "class.hPP", "Ah, regex.cpp", "regex.cpp Ah"};
for(auto fn : test_filenames)
{
if(std::regex_match(fn, cpp_regex))
{
std::cout<<"cpp file: "<<fn<<'\n';
}
}
}
catch (std::regex_error e)
{
std::cout<<e.what()<<'\t'<<e.code()<<std::endl;
}
std::cout<<"test regex icase done.\n"<<std::endl;
std::cout<<"test regex iterator usage:\n";
try
{
std::regex email_regex(email_pattern);
std::smatch results;
std::string test_email_str = "I have three emails, [email protected], [email protected] and [email protected].";
for(std::sregex_iterator it(std::begin(test_email_str), std::end(test_email_str), email_regex), end_it; it != end_it; it++)
{
std::cout<<it->str()<<std::endl;
}
}
catch (std::regex_error e)
{
std::cout<<e.what()<<'\t'<<e.code()<<std::endl;
}
std::cout<<"test regex iterator usage done.\n"<<std::endl;
std::cout<<"test regex sub_match usage:\n";
std::string phone_pattern = "(\\()?(\\d{3,4})(\\))?([- ])?(\\d{7,8})";
try
{
std::regex phone_regex(phone_pattern);
std::smatch results;
std::vector<std::string> test_phones = {"010-82224567", "(010-83332345", "(020)62334567", "(021) 22346543", "0357-4223456", "0358-465788"};
for(auto fn : test_phones)
{
if(std::regex_match(fn, results, phone_regex))
{
if(results[1].matched)
{
if(!results[3].matched) continue;
if(results[4].matched && results[4].str() == "-") continue;
}
else
{
if(results[3].matched) continue;
if(!(results[4].matched && results[4].str() == "-")) continue;
}
std::cout<<results.str()<<std::endl;
}
}
}
catch (std::regex_error e)
{
std::cout<<e.what()<<'\t'<<e.code()<<std::endl;
}
std::cout<<"test regex sub_match usage done.\n"<<std::endl;;
std::cout<<"test regex replace usage:\n";
try
{
std::string format = "$2-$5";
std::regex phone_regex(phone_pattern);
std::string ori_phone = "yubo: (020)85776452";
std::cout<<"formated phone: "<<std::regex_replace(ori_phone, phone_regex, format) <<std::endl;
}
catch (std::regex_error e)
{
std::cout<<e.what()<<'\t'<<e.code()<<std::endl;
}
std::cout<<"test regex replace usage done.\n"<<std::endl;;
}