[pfx] Re: cleanup(8): recipient_canonical can emit an over-long socketmap query with no operator guard; PERM then retried as 451

Dmytro Alieksieiev via Postfix-users:
> P.S. it would be a nice addition if pcre: tables could opt into PCRE2's 
> UTF mode via a /u inline flag, the way native PCRE already spell it. 

I thought one can request UTF mode by prepending (*UTF8) or (*UTF)
to the pattern.

> Worth noting the current handling makes u a natural letter to claim: an 
> unrecognized flag isn't rejected, it's skipped with a warning ? so 
> /(.{300})/u today drops the whole rule (and, inside an if ? ENDIF, 
> orphans the ENDIF) rather than erroring. That fail-open behavior is its 
> own small surprise, independent of the UTF question.

    $ cat /tmp/p
    IF /foo/u
    /./ yes
    ENDIF
    $ postmap -q asdf pcre:/tmp/p
    postmap: warning: pcre map /tmp/p, line 1: unknown regexp option "u": skipping this rule
    postmap: warning: pcre map /tmp/p, line 3: ignoring ENDIF without matching IF
    yes

Do you want this to be a fatal error instead of a warning?

	Wietse
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