There are two major versions of the PCRE library. The current version, PCRE2, released in 2015, is now at version 10.39.
The older, but still widely deployed PCRE library, originally released in 1997, is at version 8.45. 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.
[^] # Re: PCRE2
Posté par Benoît Sibaud (site web personnel) . En réponse au lien GNU grep 3.8 prend en charge PCRE2. Évalué à 6.
Cf https://pcre.org/
En gros tout doit migrer vers PCRE2. Et la doc PCRE2: https://pcre.org/current/doc/html/