std::basic_regex::basic_regex

basic_regex();	(1)	(since C++11)
explicit basic_regex( const CharT* s, flag_type f = std::regex_constants::ECMAScript );	(2)	(since C++11)
basic_regex( const CharT* s, std::size_t count, flag_type f = std::regex_constants::ECMAScript );	(3)	(since C++11)
basic_regex( const basic_regex& other );	(4)	(since C++11)
basic_regex( basic_regex&& other ) noexcept;	(5)	(since C++11)
template< class ST, class SA > explicit basic_regex( const std::basic_string<CharT,ST,SA>& str, flag_type f = std::regex_constants::ECMAScript );	(6)	(since C++11)
template< class ForwardIt > basic_regex( ForwardIt first, ForwardIt last, flag_type f = std::regex_constants::ECMAScript );	(7)	(since C++11)
basic_regex( std::initializer_list<CharT> init, flag_type f = std::regex_constants::ECMAScript );	(8)	(since C++11)

Constructs a new regular expression from a sequence of characters interpreted according to the flags f.

1) Default constructor. Constructs an empty regular expression which will match nothing.

2) Constructs a regex from a null-terminated string s.

3) Constructs a regex from a sequence of count characters, pointed to by s.

4) Copy constructor. Constructs a regex by copying other

5) Move constructor. Constructs a regex by with the contents of other using move semantics.

6) Constructs a regex from a string str.

7) Range constructor. Constructs the string with the contents of the range [first, last).

8) Initializer list constructor. Constructs the string with the contents of the initializer list init.

s	-	pointer to a null-terminated string
count	-	length of a character sequence used to initialize the regex
first, last	-	range of a character sequence used to initialize the regex
str	-	a basic_string used as a source used to initialize the regex
other	-	another regex to use as source to initialize the regex
init	-	initializer list used to initialize the regex
f	-	flags used to guide the interpretation of the character sequence as a regular expression
Type requirements
- `ForwardIt` must meet the requirements of LegacyForwardIterator.

1) (none)

2-3) std::regex_error if the supplied regular expression is not valid.

4-5) (none)

6-8) std::regex_error if the supplied regular expression is not valid.

Language
Standard Library Headers
Freestanding and hosted implementations
Named requirements
Language support library
Concepts library (C++20)
Diagnostics library
Utilities library
Strings library
Containers library
Iterators library
Ranges library (C++20)
Algorithms library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)
Filesystem library (C++17)
Technical Specifications