| Localization library | |||||||||||||||||||||||||
| Regular expressions library(C++11) | |||||||||||||||||||||||||
| Formatting library(C++20) | |||||||||||||||||||||||||
| Null-terminated sequence utilities | |||||||||||||||||||||||||
| Byte strings | |||||||||||||||||||||||||
| Multibyte strings | |||||||||||||||||||||||||
| Wide strings | |||||||||||||||||||||||||
| Primitive numeric conversions | |||||||||||||||||||||||||
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| Text encoding identifications | |||||||||||||||||||||||||
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| Classes | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
| Algorithms | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
| Iterators | ||||
(C++11) | ||||
(C++11) | ||||
| Exceptions | ||||
(C++11) | ||||
| Traits | ||||
(C++11) | ||||
| Constants | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
| Regex Grammar | ||||
(C++11) |
| Member functions | ||||
| State | ||||
| Element access | ||||
match_results::size | ||||
| Iterators | ||||
| Format | ||||
| Modifiers | ||||
| Non-member functions | ||||
(until C++20) | ||||
size_type size()constnoexcept; | (since C++11) | |
Returns the number of submatches, i.e.std::distance(begin(), end()).
Returns0 if*this does not represent the result of a successful match.
Contents |
(none)
The number of submatches.
Constant.
#include <iostream>#include <regex>#include <string> int main(){std::regex re("a(a)*b");std::string target("aaab");std::smatch sm; std::cout<< sm.size()<<'\n'; std::regex_match(target, sm, re);std::cout<< sm.size()<<'\n';}
Output:
02
| returns iterator to the beginning of the list of sub-matches (public member function)[edit] | |
| returns iterator to the end of the list of sub-matches (public member function)[edit] |
