##### cppreference.com

##### Search

Create account

##### Namespaces

- Page
- Discussion

##### Variants

##### Views

- View
- Edit
- History

##### Actions

# std::match_results::size

From cppreference.com
< cpp‎ | regex‎ | match results

size_type size() const; |  | (since C++11)

Returns the number of submatches, i.e. std::distance(begin(), end()).

### [edit] Parameters

(none)

### [edit] Return value

The number of submatches

### [edit] Exceptions

`noexcept` specification:
noexcept

### [edit] Complexity

Constant

### [edit] See also

### [edit] Example

Run this code

    #include <iostream>
    #include <regex>
    #include <string>

    int main()
    {
        std::regex re("a(a)*b");
        std::string target("aaab");
        std::smatch sm;

        std::regex_match(target, sm, re);
        std::cout << sm.size() << '\n';
    }

Output:

    2

Retrieved from "http://en.cppreference.com/mwiki/index.php?title=cpp/regex/match_results/size&oldid=63415"