std::regex_error:: regex_error

From cppreference.com
Defined in header <regex>
(1) (since C++11)
regex_error ( const regex_error & other ) ;
(2) (since C++11)
1) Constructs a regex_error with a given ecode of type std::regex_constants::error_type .
2) Copy constructor. Initializes the contents with those of other . If * this and other both have dynamic type std::regex_error then std:: strcmp ( what ( ) , other. what ( ) ) == 0 .

Parameters

ecode - error code indicating the error raised in regular expression parsing
other - another regex_error object to copy

See also

(C++11)
describes different types of matching errors
(typedef)