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### Headers

There are two main headers used by this library: `<boost/regex.hpp>` provides full access to the main template library, while `<boost/cregex.hpp>` provides access to the (deprecated) high level class RegEx, and the POSIX API functions.

There is also a header containing only forward declarations `<boost/regex_fwd.hpp>` for use when an interface is dependent upon `basic_regex`, but otherwise does not need the full definitions.