std::regex_iterator

C++ Reference
Language Concepts 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)

template<     class BidirectionalIterator,     class CharT = typename std::iterator_traits<BidirectionalIterator>::value_type,     class Traits = std::regex_traits<CharT> > class regex_iterator		(since C++11)

Several specializations for common character sequence types are defined:

Defined in header <regex>
Type	Definition
cregex_iterator	regex_iterator<const char*>
wcregex_iterator	regex_iterator<const wchar_t*>
sregex_iterator	regex_iterator<std::string::const_iterator>
wsregex_iterator	regex_iterator<std::wstring::const_iterator>

Example

#include <regex>
#include <iterator>
#include <iostream>
 
int main()
{
    const std::string text = "Quick brown fox.";
 
    auto begin_it = std::sregex_iterator();
    auto end_it = std::sregex_iterator(text.begin(), text.end(), std::regex("[^\\s]+"));
 
    std::cout << "The number of words is " 
              << std::distance(begin_it, end_it) << count << '\n';
}

Output:

The number of words is 3