std::sub_match::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::sub_match
Member functions sub_match::sub_match (C++11) sub_match::length (C++11) sub_match::str sub_match::operator string_type (C++11) sub_match::compare (C++11) Non-member functions operator== operator!= operator<< operator<= operator> operator>= (C++11)

difference_type length() const;

[edit] Parameters

(none)

[edit] Return value

Returns the number of characters in the match, i.e. std::distance(first, second) if the match is valid, 0 otherwise.

[edit] Complexity

Constant