std::basic_regex< _Ch_type, _Rx_traits >

Section: C Library Functions (3)
Updated: Wed Apr 17 2019
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NAME

SYNOPSIS

Public Types

typedef regex_constants::syntax_option_type flag_type

typedef traits_type::locale_type locale_type

typedef traits_type::string_type string_type

typedef _Rx_traits traits_type

typedef _Ch_type value_type

Public Member Functions

basic_regex ()

basic_regex (const _Ch_type *__p, flag_type __f=ECMAScript)
Constructs a basic regular expression from the sequence [__p, __p + char_traits<_Ch_type>::length(__p)) interpreted according to the flags in __f.
basic_regex (const _Ch_type *__p, std::size_t __len, flag_type __f=ECMAScript)
Constructs a basic regular expression from the sequence [p, p + len) interpreted according to the flags in f.
basic_regex (const basic_regex &__rhs)=default
Copy-constructs a basic regular expression.
basic_regex (basic_regex &&__rhs) noexcept=default
Move-constructs a basic regular expression.
template<typename _Ch_traits , typename _Ch_alloc > basic_regex (const std::basic_string< _Ch_type, _Ch_traits, _Ch_alloc > &__s, flag_type __f=ECMAScript)
Constructs a basic regular expression from the string s interpreted according to the flags in f.
template<typename _FwdIter > basic_regex (_FwdIter __first, _FwdIter __last, flag_type __f=ECMAScript)
Constructs a basic regular expression from the range [first, last) interpreted according to the flags in f.
basic_regex (initializer_list< _Ch_type > __l, flag_type __f=ECMAScript)
Constructs a basic regular expression from an initializer list.
~basic_regex ()
Destroys a basic regular expression.
basic_regex & assign (const basic_regex &__rhs)
the real assignment operator.
basic_regex & assign (basic_regex &&__rhs) noexcept
The move-assignment operator.
basic_regex & assign (const _Ch_type *__p, flag_type __flags=ECMAScript)
Assigns a new regular expression to a regex object from a C-style null-terminated string containing a regular expression pattern.
basic_regex & assign (const _Ch_type *__p, std::size_t __len, flag_type __flags)
Assigns a new regular expression to a regex object from a C-style string containing a regular expression pattern.
template<typename _Ch_traits , typename _Alloc > basic_regex & assign (const basic_string< _Ch_type, _Ch_traits, _Alloc > &__s, flag_type __flags=ECMAScript)
Assigns a new regular expression to a regex object from a string containing a regular expression pattern.
template<typename _InputIterator > basic_regex & assign (_InputIterator __first, _InputIterator __last, flag_type __flags=ECMAScript)
Assigns a new regular expression to a regex object.
basic_regex & assign (initializer_list< _Ch_type > __l, flag_type __flags=ECMAScript)
Assigns a new regular expression to a regex object.
flag_type flags () const
Gets the flags used to construct the regular expression or in the last call to assign().
locale_type getloc () const
Gets the locale currently imbued in the regular expression object.
locale_type imbue (locale_type __loc)
Imbues the regular expression object with the given locale.
unsigned int mark_count () const
Gets the number of marked subexpressions within the regular expression.
basic_regex & operator= (const basic_regex &__rhs)
Assigns one regular expression to another.
basic_regex & operator= (basic_regex &&__rhs) noexcept
Move-assigns one regular expression to another.
basic_regex & operator= (const _Ch_type *__p)
Replaces a regular expression with a new one constructed from a C-style null-terminated string.
basic_regex & operator= (initializer_list< _Ch_type > __l)
Replaces a regular expression with a new one constructed from an initializer list.
template<typename _Ch_traits , typename _Alloc > basic_regex & operator= (const basic_string< _Ch_type, _Ch_traits, _Alloc > &__s)
Replaces a regular expression with a new one constructed from a string.
void swap (basic_regex &__rhs)
Swaps the contents of two regular expression objects.

Static Public Attributes

Constants
std [28.8.1](1)

static constexpr flag_type icase

static constexpr flag_type nosubs

static constexpr flag_type optimize

static constexpr flag_type collate

static constexpr flag_type ECMAScript

static constexpr flag_type basic

static constexpr flag_type extended

static constexpr flag_type awk

static constexpr flag_type grep

static constexpr flag_type egrep

Friends

template<typename _Bp , typename _Ap , typename _Cp , typename _Rp , __detail::_RegexExecutorPolicy , bool > bool __detail::__regex_algo_impl (_Bp, _Bp, match_results< _Bp, _Ap > &, const basic_regex< _Cp, _Rp > &, regex_constants::match_flag_type)

template<typename , typename , typename , bool > class __detail::_Executor

Detailed Description

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>>

class std::basic_regex< _Ch_type, _Rx_traits >" Objects of specializations of this class represent regular expressions constructed from sequences of character type _Ch_type.

Storage for the regular expression is allocated and deallocated as necessary by the member functions of this class.

Definition at line 36 of file regex.h.

Constructor & Destructor Documentation

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> std::basic_regex< _Ch_type, _Rx_traits >::basic_regex () [inline]

Constructs a basic regular expression that does not match any character sequence.

Definition at line 422 of file regex.h.

Referenced by std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> std::basic_regex< _Ch_type, _Rx_traits >::basic_regex (const _Ch_type * __p, flag_type __f = ECMAScript) [inline], [explicit]

Constructs a basic regular expression from the sequence [__p, __p + char_traits<_Ch_type>::length(__p)) interpreted according to the flags in __f.

Parameters:

: __p A pointer to the start of a C-style null-terminated string containing a regular expression.
__f Flags indicating the syntax rules and options.

Exceptions:

: regex_error if __p is not a valid regular expression.

Definition at line 438 of file regex.h.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> std::basic_regex< _Ch_type, _Rx_traits >::basic_regex (const _Ch_type * __p, std::size_t __len, flag_type __f = ECMAScript) [inline]

Constructs a basic regular expression from the sequence [p, p + len) interpreted according to the flags in f.

Parameters:

: __p A pointer to the start of a string containing a regular expression.
__len The length of the string containing the regular expression.
__f Flags indicating the syntax rules and options.

Exceptions:

: regex_error if __p is not a valid regular expression.

Definition at line 454 of file regex.h.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> std::basic_regex< _Ch_type, _Rx_traits >::basic_regex (const basic_regex< _Ch_type, _Rx_traits > & __rhs) [default]

Copy-constructs a basic regular expression.

Parameters:

: __rhs A regex object.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> std::basic_regex< _Ch_type, _Rx_traits >::basic_regex (basic_regex< _Ch_type, _Rx_traits > && __rhs) [default], [noexcept]

Move-constructs a basic regular expression.

Parameters:

: __rhs A regex object.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> template<typename _Ch_traits , typename _Ch_alloc > std::basic_regex< _Ch_type, _Rx_traits >::basic_regex (const std::basic_string< _Ch_type, _Ch_traits, _Ch_alloc > & __s, flag_type __f = ECMAScript) [inline], [explicit]

Constructs a basic regular expression from the string s interpreted according to the flags in f.

Parameters:

: __s A string containing a regular expression.
__f Flags indicating the syntax rules and options.

Exceptions:

: regex_error if __s is not a valid regular expression.

Definition at line 484 of file regex.h.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> template<typename _FwdIter > std::basic_regex< _Ch_type, _Rx_traits >::basic_regex (_FwdIter __first, _FwdIter __last, flag_type __f = ECMAScript) [inline]

Constructs a basic regular expression from the range [first, last) interpreted according to the flags in f.

Parameters:

: __first The start of a range containing a valid regular expression.
__last The end of a range containing a valid regular expression.
__f The format flags of the regular expression.

Exceptions:

: regex_error if [__first, __last) is not a valid regular expression.

Definition at line 504 of file regex.h.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> std::basic_regex< _Ch_type, _Rx_traits >::basic_regex (initializer_list< _Ch_type > __l, flag_type __f = ECMAScript) [inline]

Constructs a basic regular expression from an initializer list.

Parameters:

: __l The initializer list.
__f The format flags of the regular expression.

Exceptions:

: regex_error if __l is not a valid regular expression.

Definition at line 517 of file regex.h.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> std::basic_regex< _Ch_type, _Rx_traits >::~basic_regex () [inline]

Destroys a basic regular expression.

Definition at line 524 of file regex.h.

Member Function Documentation

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::assign (const basic_regex< _Ch_type, _Rx_traits > & __rhs) [inline]

the real assignment operator.

Parameters:

: __rhs Another regular expression object.

Definition at line 582 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::swap().

Referenced by std::basic_regex< _Ch_type, _Rx_traits >::assign(), and std::basic_regex< _Ch_type, _Rx_traits >::operator=().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::assign (basic_regex< _Ch_type, _Rx_traits > && __rhs) [inline], [noexcept]

The move-assignment operator.

Parameters:

: __rhs Another regular expression object.

Definition at line 595 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::swap().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::assign (const _Ch_type * __p, flag_type __flags = ECMAScript) [inline]

Assigns a new regular expression to a regex object from a C-style null-terminated string containing a regular expression pattern.

Parameters:

: __p A pointer to a C-style null-terminated string containing a regular expression pattern.
__flags Syntax option flags.

Exceptions:

: regex_error if __p does not contain a valid regular expression pattern interpreted according to __flags. If regex_error is thrown, *this remains unchanged.

Definition at line 616 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::assign (const _Ch_type * __p, std::size_t __len, flag_type __flags) [inline]

Assigns a new regular expression to a regex object from a C-style string containing a regular expression pattern.

Parameters:

: __p A pointer to a C-style string containing a regular expression pattern.
__len The length of the regular expression pattern string.
__flags Syntax option flags.

Exceptions:

: regex_error if p does not contain a valid regular expression pattern interpreted according to __flags. If regex_error is thrown, *this remains unchanged.

Definition at line 633 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> template<typename _Ch_traits , typename _Alloc > basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::assign (const basic_string< _Ch_type, _Ch_traits, _Alloc > & __s, flag_type __flags = ECMAScript) [inline]

Assigns a new regular expression to a regex object from a string containing a regular expression pattern.

Parameters:

: __s A string containing a regular expression pattern.
__flags Syntax option flags.

Exceptions:

: regex_error if __s does not contain a valid regular expression pattern interpreted according to __flags. If regex_error is thrown, *this remains unchanged.

Definition at line 649 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign(), std::basic_regex< _Ch_type, _Rx_traits >::basic_regex(), std::basic_string< _CharT, _Traits, _Alloc >::data(), and std::basic_string< _CharT, _Traits, _Alloc >::size().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> template<typename _InputIterator > basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::assign (_InputIterator __first, _InputIterator __last, flag_type __flags = ECMAScript) [inline]

Assigns a new regular expression to a regex object.

Parameters:

: __first The start of a range containing a valid regular expression.
__last The end of a range containing a valid regular expression.
__flags Syntax option flags.

Exceptions:

: regex_error if p does not contain a valid regular expression pattern interpreted according to __flags. If regex_error is thrown, the object remains unchanged.

Definition at line 671 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::assign (initializer_list< _Ch_type > __l, flag_type __flags = ECMAScript) [inline]

Assigns a new regular expression to a regex object.

Parameters:

: __l An initializer list representing a regular expression.
__flags Syntax option flags.

Exceptions:

: regex_error if __l does not contain a valid regular expression pattern interpreted according to __flags. If regex_error is thrown, the object remains unchanged.

Definition at line 687 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> flag_type std::basic_regex< _Ch_type, _Rx_traits >::flags () const [inline]

Gets the flags used to construct the regular expression or in the last call to assign().

Definition at line 708 of file regex.h.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> locale_type std::basic_regex< _Ch_type, _Rx_traits >::getloc () const [inline]

Gets the locale currently imbued in the regular expression object.

Definition at line 730 of file regex.h.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> locale_type std::basic_regex< _Ch_type, _Rx_traits >::imbue (locale_type __loc) [inline]

Imbues the regular expression object with the given locale.

Parameters:

: __loc A locale.

Definition at line 718 of file regex.h.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> unsigned int std::basic_regex< _Ch_type, _Rx_traits >::mark_count () const [inline]

Gets the number of marked subexpressions within the regular expression.

Definition at line 696 of file regex.h.

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::operator= (const basic_regex< _Ch_type, _Rx_traits > & __rhs) [inline]

Assigns one regular expression to another.

Definition at line 531 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::operator= (basic_regex< _Ch_type, _Rx_traits > && __rhs) [inline], [noexcept]

Move-assigns one regular expression to another.

Definition at line 538 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::operator= (const _Ch_type * __p) [inline]

Replaces a regular expression with a new one constructed from a C-style null-terminated string.

Parameters:

: __p A pointer to the start of a null-terminated C-style string containing a regular expression.

Definition at line 549 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::operator= (initializer_list< _Ch_type > __l) [inline]

Replaces a regular expression with a new one constructed from an initializer list.

Parameters:

: __l The initializer list.

Exceptions:

: regex_error if __l is not a valid regular expression.

Definition at line 561 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> template<typename _Ch_traits , typename _Alloc > basic_regex& std::basic_regex< _Ch_type, _Rx_traits >::operator= (const basic_string< _Ch_type, _Ch_traits, _Alloc > & __s) [inline]

Replaces a regular expression with a new one constructed from a string.

Parameters:

: __s A pointer to a string containing a regular expression.

Definition at line 572 of file regex.h.

References std::basic_regex< _Ch_type, _Rx_traits >::assign().

template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> void std::basic_regex< _Ch_type, _Rx_traits >::swap (basic_regex< _Ch_type, _Rx_traits > & __rhs) [inline]

Swaps the contents of two regular expression objects.

Parameters:

: __rhs Another regular expression object.

Definition at line 740 of file regex.h.

Referenced by std::basic_regex< _Ch_type, _Rx_traits >::assign().

Author

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