Hi, PCRE has been in Debian for some time; the current packages correspond to upstream 8.35 (with a pile of backported security fixes, which I hope will end up as an 8.38 release some time soon). These packages are called pcre3 (and libpcre3 ships libpcre.so.3).
Upstream has a new PCRE library, which they hope everyone will eventually migrate to, which is called PCRE2. It is currently version 10.20. It ships things named like libpcre2-8.so.0, and its pcregrep is called pcre2grep. The natural thing to call the PCRE2 packages is pcre2, but that's going to lead to confusion - ISTM that something that makes it clear that PCRE2 is newer than PCRE is desirable. And, obviously, PCRE & PCRE2 need to be co-installable. Smart ideas? Regards, Matthew