std::match_results::length

From Cppreference

C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
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)
std::match_results
Member functions match_results::match_results (C++11) match_results::~match_results (C++11) match_results::operator= (C++11) match_results::get_allocator (C++11) State match_results::ready (C++11) Element access match_results::size (C++11) match_results::max_size (C++11) match_results::empty (C++11) match_results::length (C++11) match_results::position (C++11) match_results::str (C++11) match_results::operator_at (C++11) match_results::prefix (C++11) match_results::suffix (C++11) Iterators match_results::begin match_results::cbegin (C++11) match_results::end match_results::cend (C++11) Format match_results::format (C++11) Modifiers match_results::swap (C++11)

difference_type length( size_type sub = 0 ) const;		(C++11 feature)

[edit] Parameters

sub

-

Indicates the sub_match.

[edit] Return value

Returns the number of characters in the indicated match if the match is valid, 0 otherwise.

[edit] See also

cpp/regex/sub_match/length