The PCRE library is a set of functions that implement regular expression pattern matching
using the same syntax and semantics as Perl 5. PCRE has its own native API, as well as
a set of wrapper functions that correspond to the POSIX regular expression API.
This version of PCRE is now at end of life, and is no longer being actively maintained.
Version 8.45 is expected to be the final release of the older PCRE library,
and new projects should use PCRE2 instead.
PCRE html documents is https://www.pcre.org/original/doc/html/.
