Character Types

This lesson will explain how regex identifies the different types of text in C++.

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

The following table shows the four different combinations of type of text, regular expression, search result, and action:

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.

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