| Defined in header <regex> | ||
|---|---|---|
template<
class BidirIt,
class Alloc = std::allocator<std::sub_match<BidirIt>>
> class match_results; | (since C++11) |
The class template std::match_results holds a collection of character sequences that represent the result of a regular expression match.
This is a specialized allocator-aware container. It can only be default created, obtained from std::regex_iterator, or modified by std::regex_search or std::regex_match. Because std::match_results holds std::sub_matches, each of which is a pair of iterators into the original character sequence that was matched, it's undefined behavior to examine std::match_results if the original character sequence was destroyed or iterators to it were invalidated for other reasons.
The first sub_match (index 0) contained in a match_result always represents the full match within a target sequence made by a regex, and subsequent sub_matches represent sub-expression matches corresponding in sequence to the left parenthesis delimiting the sub-expression in the regex.
Type requirements
- BidirIt must meet the requirements of BidirectionalIterator. | ||
- Alloc must meet the requirements of Allocator. |
Specializations
Several specializations for common character sequence types are provided:
| Defined in header <regex> | |
|---|---|
| Type | Definition |
cmatch | match_results<const char*> |
wcmatch | match_results<const wchar_t*> |
smatch | match_results<std::string::const_iterator> |
wsmatch | match_results<std::wstring::const_iterator> |
Member types
| Member type | Definition |
|---|---|
allocator_type | Allocator |
value_type | std::sub_match<BidirIt> |
const_reference | const value_type& |
reference | value_type& |
const_iterator | implementation defined (depends on the underlying container) |
iterator | const_iterator |
difference_type | std::iterator_traits<BidirIt>::difference_type |
size_type | std::allocator_traits<Alloc>::size_type |
char_type | std::iterator_traits<BidirIt>::value_type |
string_type | std::basic_string<char_type> |
Member functions
| constructs the object (public member function) | |
| (destructor)
| destructs the object (public member function) |
| operator=
| assigns the contents (public member function) |
| returns the associated allocator (public member function) | |
State | |
| checks if the results are available (public member function) | |
Size | |
| checks whether the match was successful (public member function) | |
| returns the number of matches in a fully-established result state (public member function) | |
| returns the maximum possible number of sub-matches (public member function) | |
Element access | |
| returns the length of the particular sub-match (public member function) | |
| returns the position of the first character of the particular sub-match (public member function) | |
| returns the sequence of characters for the particular sub-match (public member function) | |
| returns specified sub-match (public member function) | |
| returns sub-sequence between the beginning of the target sequence and the beginning of the full match. (public member function) | |
| returns sub-sequence between the end of the full match and the end of the target sequence (public member function) | |
Iterators | |
| returns iterator to the beginning of the list of sub-matches (public member function) | |
| returns iterator to the end of the list of sub-matches (public member function) | |
Format | |
| formats match results for output (public member function) | |
Modifiers | |
| swaps the contents (public member function) | |
Non-member functions
| lexicographically compares the values in the two match result (function template) | |
| (C++11) | specializes the std::swap() algorithm (function template) |
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