# std::sub_match<BidirIt>::operator string_type, std::sub_match<BidirIt>::str

From cppreference.com
< cpp‎ | regex‎ | sub match

operator string_type() const; | (1) |
string_type str() const; | (2) |

Converts to an object of the underlying std::basic_string type.

1) An implicit conversion.
2) An explicit conversion.

### Return value

The matched character sequence as an object of the underlying std::basic_string type. If the `matched` member is false, then returns the empty string.

### Complexity

Linear in the length of the underlying character sequence.

### Example

Run this code

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

    int main()
    {
        const std::string html{R"("<a href="https://cppreference.com/">)"};
        const std::regex re{"(http|https|ftp)://([a-z]+)\\.([a-z]{3})"};
        std::smatch parts;
        std::regex_search(html, parts, re);
        for (std::ssub_match const& sub : parts)
        {
            const std::string s = sub; // (1) implicit conversion
            assert(s == sub.str());    // (2)
            std::cout << s << '\n';
        }
    }

Output:

    https://cppreference.com
    https
    cppreference
    com

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