std::basic_regex<CharT,Traits>::assign
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basic_regex& assign( const basic_regex& other );
 (1) 
 (since C++11) 
basic_regex& assign( basic_regex&& other ) noexcept;
 (2) 
 (since C++11) 
basic_regex& assign( const CharT* s,
flag_type f = std::regex_constants::ECMAScript );
 (3) 
 (since C++11) 
flag_type f = std::regex_constants::ECMAScript );
basic_regex& assign( const CharT* ptr, std::size_t count,
flag_type f = std::regex_constants::ECMAScript );
 (4) 
 (since C++11) 
flag_type f = std::regex_constants::ECMAScript );
template< class ST, class SA >
 (5) 
 (since C++11) 
basic_regex& assign( const std::basic_string <CharT,ST,SA>& str,
template< class InputIt >
 (6) 
 (since C++11) 
basic_regex& assign( InputIt first, InputIt last,
basic_regex& assign( std::initializer_list <CharT> ilist,
flag_type f = std::regex_constants::ECMAScript );
 (7) 
 (since C++11) 
flag_type f = std::regex_constants::ECMAScript );
Assigns the contents to the regular expression.
1) Assigns the contents of other. flags()  and mark_count()  are equivalent to the values of other.flags() and other.mark_count() after the call.
2) Assigns the contents of other using move semantics. flags()  and mark_count()  are equivalent to the values of other.flags() and other.mark_count() before the assignment. After the call, other is in a valid, but unspecified state.
3-7) Assigns a sequence of characters to the regular expression. The syntax flags are set to 
f. mark_count()  returns the number of marked subexpressions within the resulting subexpression after the call.3) Assigns a null-terminated string pointed to by s.
4) Assigns a sequence of count characters, pointed to by s.
5) Assigns the string str.
6) Assigns the characters in the range 
[first, last).7) Assigns the characters in the initializer list ilist.
[edit] Parameters
 other
 -
 another regular expression to assign
 s
 -
 pointer to a character sequence to assign
 str
 -
 string to assign
 first, last
 -
 the range of characters to assign
 ilist
 -
 initializer list containing characters to assign
 Type requirements
 -
InputIt must meet the requirements of LegacyInputIterator.
[edit] Return value
*this
[edit] Exceptions
1) May throw implementation-defined exceptions.
3-7) std::regex_error  if the supplied regular expression is not valid. The object is not modified in that case.
[edit] Example
 This section is incomplete
Reason: no example
Reason: no example