Regular expressions library (since C++11)

The regular expressions library provides a class that represents regular expressions, which are a kind of mini-language used to perform pattern matching within strings. Almost all operations with regexes can be characterized by operating on several of the following objects:

• Target sequence. The character sequence that is searched for a pattern. This may be a range specified by two iterators, a null-terminated character string or a std::string.

• Pattern. This is the regular expression itself. It determines what constitutes a match. It is an object of type std::basic_regex, constructed from a string with special grammar.

• Matched array. The information about matches may be retrieved as an object of type std::match_results.

• Replacement string. This is a string that determines how to replace the matches.