Boost C++ Libraries

The type syntax_option_type is an implementation specific bitmask type (see C++ standard 17.3.2.1.2). Setting its elements has the effects listed in the table below, a valid value of type syntax_option_type will always have exactly one of the elements normal, basic, extended, awk, grep, egrep, sed, literal or perl set.

Note that for convenience all the constants listed here are duplicated within the scope of class template basic_regex, so you can use any of:

boost::regex_constants::constant_name

or

boost::regex::constant_name

or

boost::wregex::constant_name

in an interchangeable manner.