Provided by: libstdc++-13-doc_13.2.0-23ubuntu4_all 
NAME
std::match_results< _Bi_iter, _Alloc > - The results of a match or search operation.
SYNOPSIS
#include <regex>
Inherits std::vector< _Tp, _Alloc >.
Public Types
28.10 Public Types
typedef sub_match< _Bi_iter > value_type
typedef const value_type & const_reference
typedef value_type & reference
typedef _Base_type::const_iterator const_iterator
typedef const_iterator iterator
typedef __iter_traits::difference_type difference_type
typedef allocator_traits< _Alloc >::size_type size_type
typedef _Alloc allocator_type
typedef __iter_traits::value_type char_type
typedef std::basic_string< char_type > string_type
Public Member Functions
template<typename _Out_iter > _Out_iter format (_Out_iter __out, const match_results<
_Bi_iter, _Alloc >::char_type *__fmt_first, const match_results< _Bi_iter, _Alloc
>::char_type *__fmt_last, match_flag_type __flags) const
bool ready () const noexcept
Indicates if the match_results is ready.
28.10.1 Construction, Copying, and Destruction
match_results ()
Constructs a default match_results container.
match_results (const _Alloc &__a) noexcept
Constructs a default match_results container.
match_results (const match_results &)=default
Copy constructs a match_results.
match_results (match_results &&) noexcept=default
Move constructs a match_results.
match_results & operator= (const match_results &)=default
Assigns rhs to *this.
match_results & operator= (match_results &&)=default
Move-assigns rhs to *this.
~match_results ()=default
Destroys a match_results object.
match_results (const match_results &__m, const _Alloc &__a)
Constructs a default match_results container.
match_results (match_results &&__m, const _Alloc &__a)
noexcept(noexcept(_Base_type(std::move(__m), __a)))
Constructs a default match_results container.
28.10.2 Size
size_type size () const noexcept
Gets the number of matches and submatches.
size_type max_size () const noexcept
Gets the number of matches and submatches.
bool empty () const noexcept
Indicates if the match_results contains no results.
28.10.4 Element Access
difference_type length (size_type __sub=0) const
Gets the length of the indicated submatch.
difference_type position (size_type __sub=0) const
Gets the offset of the beginning of the indicated submatch.
string_type str (size_type __sub=0) const
Gets the match or submatch converted to a string type.
const_reference operator[] (size_type __sub) const
Gets a sub_match reference for the match or submatch.
const_reference prefix () const
Gets a sub_match representing the match prefix.
const_reference suffix () const
Gets a sub_match representing the match suffix.
const_iterator begin () const noexcept
Gets an iterator to the start of the sub_match collection.
const_iterator cbegin () const noexcept
Gets an iterator to the start of the sub_match collection.
const_iterator end () const noexcept
Gets an iterator to one-past-the-end of the collection.
const_iterator cend () const noexcept
Gets an iterator to one-past-the-end of the collection.
28.10.5 Formatting
These functions perform formatted substitution of the matched character sequences into
their target. The format specifiers and escape sequences accepted by these functions are
determined by their flags parameter as documented above.
template<typename _Out_iter > _Out_iter format (_Out_iter __out, const char_type
*__fmt_first, const char_type *__fmt_last, match_flag_type
__flags=regex_constants::format_default) const
template<typename _Out_iter , typename _St , typename _Sa > _Out_iter format
(_Out_iter __out, const basic_string< char_type, _St, _Sa > &__fmt,
match_flag_type __flags=regex_constants::format_default) const
template<typename _St , typename _Sa > basic_string< char_type, _St, _Sa > format
(const basic_string< char_type, _St, _Sa > &__fmt, match_flag_type
__flags=regex_constants::format_default) const
string_type format (const char_type *__fmt, match_flag_type
__flags=regex_constants::format_default) const
28.10.6 Allocator
allocator_type get_allocator () const noexcept
Gets a copy of the allocator.
28.10.7 Swap
void swap (match_results &__that) noexcept
Swaps the contents of two match_results.
Private Member Functions
constexpr iterator begin () noexcept
constexpr iterator end () noexcept
constexpr const_reference operator[] (size_type __n) const noexcept
Subscript access to the data contained in the vector.
constexpr reference operator[] (size_type __n) noexcept
Subscript access to the data contained in the vector.
constexpr void swap (vector &__x) noexcept
Swaps data with another vector.
Friends
template<typename , typename , typename > class regex_iterator
Related Symbols
(Note that these are not member symbols.)
template<typename _Bi_iter , class _Alloc > bool operator!= (const match_results<
_Bi_iter, _Alloc > &__m1, const match_results< _Bi_iter, _Alloc > &__m2)
Compares two match_results for inequality.
template<typename _Bi_iter , typename _Alloc > bool operator== (const match_results<
_Bi_iter, _Alloc > &__m1, const match_results< _Bi_iter, _Alloc > &__m2)
Compares two match_results for equality.
template<typename _Bi_iter , typename _Alloc > void swap (match_results< _Bi_iter, _Alloc
> &__lhs, match_results< _Bi_iter, _Alloc > &__rhs) noexcept
Swaps two match results.
Detailed Description
template<typename _Bi_iter, typename _Alloc = allocator<sub_match<_Bi_iter> >>
class std::match_results< _Bi_iter, _Alloc >"The results of a match or search operation.
A collection of character sequences representing the result of a regular expression match.
Storage for the collection is allocated and freed as necessary by the member functions of
class template match_results.
This class satisfies the Sequence requirements, with the exception that only the
operations defined for a const-qualified Sequence are supported.
The sub_match object stored at index 0 represents sub-expression 0, i.e. the whole match.
In this case the sub_match member matched is always true. The sub_match object stored at
index n denotes what matched the marked sub-expression n within the matched expression. If
the sub-expression n participated in a regular expression match then the sub_match member
matched evaluates to true, and members first and second denote the range of characters
[first, second) which formed that match. Otherwise matched is false, and members first and
second point to the end of the sequence that was searched.
Since
C++11
Constructor & Destructor Documentation
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
std::match_results< _Bi_iter, _Alloc >::match_results () [inline]
Constructs a default match_results container.
Postcondition
size() returns 0 and str() returns an empty string.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
std::match_results< _Bi_iter, _Alloc >::match_results (const _Alloc & __a) [inline],
[explicit], [noexcept]
Constructs a default match_results container.
Postcondition
size() returns 0 and str() returns an empty string.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
std::match_results< _Bi_iter, _Alloc >::match_results (const match_results< _Bi_iter,
_Alloc > &) [default]
Copy constructs a match_results.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
std::match_results< _Bi_iter, _Alloc >::match_results (match_results< _Bi_iter, _Alloc >
&&) [default], [noexcept]
Move constructs a match_results.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
std::match_results< _Bi_iter, _Alloc >::~match_results () [default]
Destroys a match_results object.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
std::match_results< _Bi_iter, _Alloc >::match_results (const match_results< _Bi_iter,
_Alloc > & __m, const _Alloc & __a) [inline]
Constructs a default match_results container.
Postcondition
size() returns 0 and str() returns an empty string.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
std::match_results< _Bi_iter, _Alloc >::match_results (match_results< _Bi_iter, _Alloc >
&& __m, const _Alloc & __a) [inline], [noexcept]
Constructs a default match_results container.
Postcondition
size() returns 0 and str() returns an empty string.
Member Function Documentation
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
const_iterator std::match_results< _Bi_iter, _Alloc >::begin () const [inline],
[noexcept]
Gets an iterator to the start of the sub_match collection.
Referenced by std::match_results< _Bi_iter, _Alloc >::cbegin().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
const_iterator std::match_results< _Bi_iter, _Alloc >::cbegin () const [inline],
[noexcept]
Gets an iterator to the start of the sub_match collection.
References std::match_results< _Bi_iter, _Alloc >::begin().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
const_iterator std::match_results< _Bi_iter, _Alloc >::cend () const [inline], [noexcept]
Gets an iterator to one-past-the-end of the collection.
References std::match_results< _Bi_iter, _Alloc >::end().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >> bool
std::match_results< _Bi_iter, _Alloc >::empty () const [inline], [noexcept]
Indicates if the match_results contains no results.
Return values
true The match_results object is empty.
false The match_results object is not empty.
Referenced by std::match_results< _Bi_iter, _Alloc >::prefix(), and std::match_results<
_Bi_iter, _Alloc >::suffix().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
const_iterator std::match_results< _Bi_iter, _Alloc >::end () const [inline], [noexcept]
Gets an iterator to one-past-the-end of the collection.
Referenced by std::match_results< _Bi_iter, _Alloc >::cend().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
template<typename _Out_iter , typename _St , typename _Sa > _Out_iter std::match_results<
_Bi_iter, _Alloc >::format (_Out_iter __out, const basic_string< char_type, _St, _Sa > &
__fmt, match_flag_type __flags = regex_constants::format_default) const [inline]
Precondition
ready() == true
References std::match_results< _Bi_iter, _Alloc >::format().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
template<typename _Out_iter > _Out_iter std::match_results< _Bi_iter, _Alloc >::format
(_Out_iter __out, const char_type * __fmt_first, const char_type * __fmt_last,
match_flag_type __flags = regex_constants::format_default) const
Precondition
ready() == true
Referenced by std::match_results< _Bi_iter, _Alloc >::format(), std::match_results<
_Bi_iter, _Alloc >::format(), and std::match_results< _Bi_iter, _Alloc >::format().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
template<typename _St , typename _Sa > basic_string< char_type, _St, _Sa >
std::match_results< _Bi_iter, _Alloc >::format (const basic_string< char_type, _St, _Sa >
& __fmt, match_flag_type __flags = regex_constants::format_default) const [inline]
Precondition
ready() == true
References std::back_inserter(), and std::match_results< _Bi_iter, _Alloc >::format().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >> string_type
std::match_results< _Bi_iter, _Alloc >::format (const char_type * __fmt, match_flag_type
__flags = regex_constants::format_default) const [inline]
Precondition
ready() == true
References std::back_inserter(), and std::match_results< _Bi_iter, _Alloc >::format().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
allocator_type std::match_results< _Bi_iter, _Alloc >::get_allocator () const [inline],
[noexcept]
Gets a copy of the allocator.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
difference_type std::match_results< _Bi_iter, _Alloc >::length (size_type __sub = 0) const
[inline]
Gets the length of the indicated submatch.
Parameters
__sub indicates the submatch.
Precondition
ready() == true
This function returns the length of the indicated submatch, or the length of the entire
match if __sub is zero (the default).
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >> size_type
std::match_results< _Bi_iter, _Alloc >::max_size () const [inline], [noexcept]
Gets the number of matches and submatches. The number of matches for a given regular
expression will be either 0 if there was no match or mark_count() + 1 if a match was
successful. Some matches may be empty.
Returns
the number of matches found.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >> match_results
& std::match_results< _Bi_iter, _Alloc >::operator= (const match_results< _Bi_iter, _Alloc
> &) [default]
Assigns rhs to *this.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >> match_results
& std::match_results< _Bi_iter, _Alloc >::operator= (match_results< _Bi_iter, _Alloc > &&)
[default]
Move-assigns rhs to *this.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
const_reference std::match_results< _Bi_iter, _Alloc >::operator[] (size_type __sub) const
[inline]
Gets a sub_match reference for the match or submatch.
Parameters
__sub indicates the submatch.
Precondition
ready() == true
This function gets a reference to the indicated submatch, or the entire match if __sub is
zero.
If __sub >= size() then this function returns a sub_match with a special value indicating
no submatch.
References std::match_results< _Bi_iter, _Alloc >::ready(), and std::match_results<
_Bi_iter, _Alloc >::size().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
difference_type std::match_results< _Bi_iter, _Alloc >::position (size_type __sub = 0)
const [inline]
Gets the offset of the beginning of the indicated submatch.
Parameters
__sub indicates the submatch.
Precondition
ready() == true
This function returns the offset from the beginning of the target sequence to the
beginning of the submatch, unless the value of __sub is zero (the default), in which case
this function returns the offset from the beginning of the target sequence to the
beginning of the match.
References std::distance().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
const_reference std::match_results< _Bi_iter, _Alloc >::prefix () const [inline]
Gets a sub_match representing the match prefix.
Precondition
ready() == true
This function gets a reference to a sub_match object representing the part of the target
range between the start of the target range and the start of the match.
References std::match_results< _Bi_iter, _Alloc >::empty(), and std::match_results<
_Bi_iter, _Alloc >::ready().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >> bool
std::match_results< _Bi_iter, _Alloc >::ready () const [inline], [noexcept]
Indicates if the match_results is ready.
Return values
true The object has a fully-established result state.
false The object is not ready.
Referenced by std::match_results< _Bi_iter, _Alloc >::operator[](), std::match_results<
_Bi_iter, _Alloc >::prefix(), and std::match_results< _Bi_iter, _Alloc >::suffix().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >> size_type
std::match_results< _Bi_iter, _Alloc >::size () const [inline], [noexcept]
Gets the number of matches and submatches. The number of matches for a given regular
expression will be either 0 if there was no match or mark_count() + 1 if a match was
successful. Some matches may be empty.
Returns
the number of matches found.
Referenced by std::match_results< _Bi_iter, _Alloc >::operator[]().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >> string_type
std::match_results< _Bi_iter, _Alloc >::str (size_type __sub = 0) const [inline]
Gets the match or submatch converted to a string type.
Parameters
__sub indicates the submatch.
Precondition
ready() == true
This function gets the submatch (or match, if __sub is zero) extracted from the target
range and converted to the associated string type.
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >>
const_reference std::match_results< _Bi_iter, _Alloc >::suffix () const [inline]
Gets a sub_match representing the match suffix.
Precondition
ready() == true
This function gets a reference to a sub_match object representing the part of the target
range between the end of the match and the end of the target range.
References std::match_results< _Bi_iter, _Alloc >::empty(), and std::match_results<
_Bi_iter, _Alloc >::ready().
template<typename _Bi_iter , typename _Alloc = allocator<sub_match<_Bi_iter> >> void
std::match_results< _Bi_iter, _Alloc >::swap (match_results< _Bi_iter, _Alloc > & __that)
[inline], [noexcept]
Swaps the contents of two match_results.
References std::swap(), and std::match_results< _Bi_iter, _Alloc >::swap().
Referenced by std::match_results< _Bi_iter, _Alloc >::swap().
Author
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