Character Types

The type of text determines the character type of the regular expression, the type of search result, and the type of action that will be taken with the search result.

This table shows four different combinations:

Text type	Regular expression type	Result type	Action type
const char*	std::regex	std::smatch	std::regex_search
std::string	std::regex	std::smatch	std::regex_search
const wchar_t*	std::wregex	std::wcmatch	std::wregex_search
std::wstring	std::wregex	std::wsmatch	std::wregex_search

Combinations of type of text, regular expression, search result and action

The program shown in the Search section of this chapter provides the four combinations in detail.