std::regex, to match begin/end of string

Question

In JS regular expressions symbols ^ and $ designate start and end of the string. And only with /m modifier (multiline

Answer 1

The following code snippet matches email addresses starting [a-z] followed by 0 or 1 dot, then by 0 or more a-z letters, then ending with "@gmail.com". I tested it.

string reg = "^[a-z]+\\.*[a-z]*@gmail\\.com$";

regex reg1(reg, regex_constants::icase);
reg1(regex_str, regex_constants::icase);
string email;
cin>>email;
if (regex_search(email, reg1))