Good day!
Here is pcre2test listing: PCRE2 version 10.33 2019-04-16 /\A(?:.|..)(*THEN)c/ abc No match Perl is match "abc".I suppose "next innermost alternative" is interpreted differently by PCRE and Perl.
If so, may be PCRE should go Perl way in this matter? Thanks. --## List details at https://lists.exim.org/mailman/listinfo/pcre-dev