This package doesn't provide the ability to do regex matching, but instead
provides the type-classes that constitute the abstract API that is implemented
by 'regex-*' backends such as
* <//hackage.haskell.org/package/regex-posix regex-posix>
* <//hackage.haskell.org/package/regex-parsec regex-parsec>
* <//hackage.haskell.org/package/regex-dfa regex-dfa>
* <//hackage.haskell.org/package/regex-tdfa regex-tdfa>
* <//hackage.haskell.org/package/regex-pcre regex-pcre>
See also <https://wiki.haskell.org/Regular_expressions> for more information.