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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.