std::sub_match
| Defined in header <regex>
|
||
| template< class BidirIt |
(since C++11) | |
The class template sub_match is used by the regular expression engine to denote sequences of characters matched by marked sub-expressions.
A match is a [begin, end) pair within the target range matched by the regular expression, but with additional observer functions to enhance code clarity.
Only the default constructor is publicly accessible. Instances of sub_match are normally constructed and populated as a part of a std::match_results container during the processing of one of the regex algorithms.
The member functions return defined default values unless the matched member is true.
sub_match inherits from std::pair<BidirIt, BidirIt>, although it cannot be treated as a std::pair object because member functions such as swap and assignment will not work as expected.
Contents |
[edit] Type requirements
-BidirIt must meet the requirements of BidirectionalIterator.
|
[edit] Specializations
Several specializations for common character sequence types are provided:
| Defined in header
<regex> | |
| Type | Definition |
csub_match
|
sub_match<const char*> |
wcsub_match
|
sub_match<const wchar_t*> |
ssub_match
|
sub_match<std::string::const_iterator> |
wssub_match
|
sub_match<std::wstring::const_iterator> |
[edit] Member types
| Member type | Definition |
iterator
|
BidirIt |
value_type
|
std::iterator_traits<BidirIt>::value_type |
difference_type
|
std::iterator_traits<BidirIt>::difference_type |
string_type
|
std::basic_string<value_type> |
[edit] Member objects
matched
|
Indicates if this match was successful. |
Inherited from std::pair
first
|
Start of the match sequence. |
second
|
One-past-the-end of the match sequence. |
[edit] Member functions
| constructs the match object (public member function) | |
Observers | |
| returns the length of the match (if any) (public member function) | |
| converts to the underlying string type (public member function) | |
| compares matched subsequence (if any) (public member function) | |
[edit] Non-member functions
compares two sub_match objects (function) | |
| outputs the matched character subsequence (function template) |
[edit] See also
| (C++11) |
iterates through regex submatches (class template) |