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

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

Technical specifications

Symbols index

External libraries

 

Regular expressions library

Classes

basic_regex (C++11)

sub_match (C++11)

match_results (C++11)

Algorithms

regex_match (C++11)

regex_search (C++11)

regex_replace (C++11)

Iterators

regex_iterator (C++11)

regex_token_iterator (C++11)

Exceptions

regex_error (C++11)

Traits

regex_traits (C++11)

Constants

syntax_option_type (C++11)

match_flag_type (C++11)

error_type (C++11)

Regex Grammar

Modified ECMAScript-262 (C++11)

 

std::sub_match

Member functions

sub_match::sub_match

sub_match::length

sub_match::strsub_match::operator string_type

sub_match::compare

Non-member functions

operator==operator!=operator<<operator<=operator>operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)

operator<<

 

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

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

The first version is an implicit conversion, the second one is explicit.

Parameters

(none)

Return value

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

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