Install libghc-regex-pcre-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-regex-pcre-doc
Description:
Perl-compatible regular expressions; documentation
A library containing the PCRE backend to accompany regex-base. . This package contains the API documentation of the library.
Homepage: http://hackage.haskell.org/package/regex-pcre
Version: 0.94.4-9build1
Section: universe/doc