std::basic_regex<CharT,Traits>::swap
From cppreference.com
                    
                                        
                    < cpp | regex | basic regex
                    
                                                            
                    | void swap( basic_regex& other ) noexcept; | (since C++11) | |
Exchanges the contents of two regular expressions.
Parameters
| other | - | the regular expression to swap with | 
Return value
(none)
Example
| This section is incomplete Reason: no example | 
See also
| (C++11) | specializes the std::swap algorithm (function template) |