The Search Result
Whenever we verify whether a piece of text satisfies our regular expression, we have to store the results somewhere. std::match_results allows us to do just that.
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The object of type std::match_results is the result of a std::regex_match or std::regex_search. std::match_results is a sequential container having at least one capture group of a std::sub_match object. The std::sub_match objects are sequences of characters.
ℹ️ What is a capture group?
Capture groups allow it to further analyse the search result in a regular expression. They are defined by a pair of parentheses(). The regular expression((a+)(b+)(c+))has four capture groups:((a+)(b+)(c+)), (a+), (b+)and(c+)The total result is the 0th capture group.
C++ has four types of synonyms of type std::match_results: