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Showing content from https://en.cppreference.com/w/cpp/language/../regex/basic_regex/../match_results/empty.html below:

std::match_results<BidirIt,Alloc>::empty - cppreference.com

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) Diagnostics library Memory management library Metaprogramming library (C++11) General utilities library Containers library Iterators library Ranges library (C++20) Algorithms library Strings library Text processing library Numerics library Date and time library Input/output library Filesystem library (C++17) Concurrency support library (C++11) Execution control library (C++26) Technical specifications Symbols index External libraries [edit] Text processing library Localization library Regular expressions library (C++11) Formatting library (C++20) Null-terminated sequence utilities Byte strings Multibyte strings Wide strings Primitive numeric conversions to_chars

(C++17)

to_chars_result

(C++17)

from_chars

(C++17)

from_chars_result

(C++17)

chars_format

(C++17)

Text encoding identifications text_encoding

(C++26)

[edit] 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)

[edit] std::match_results Member functions match_results::match_results match_results::~match_results match_results::operator= match_results::get_allocator State match_results::ready Element access match_results::size match_results::max_size

match_results::empty

match_results::length match_results::position match_results::str match_results::operator[] match_results::prefix match_results::suffix Iterators match_results::beginmatch_results::cbegin match_results::endmatch_results::cend Format match_results::format Modifiers match_results::swap Non-member functions operator==operator!=

(until C++20)

swap(std::match_results) [edit]

bool empty() const;

(since C++11)

Checks whether the match was successful.

Contents

[edit] Parameters

(none)

[edit] Return value

true if *this represents the result of a failed match, false otherwise, i.e. size() == 0.

[edit] Exceptions

May throw implementation-defined exceptions.

[edit] Complexity

Constant.

[edit] See also size returns the number of matches in a fully-established result state
(public member function) [edit]

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