2.4.2 replaced libc regex(3) with libpcre2, maybe it is this?

Aki

 On 07/12/2025 13:44 EET Luca Weiss via dovecot <[1]dovecot@dovecot.org>
 wrote:


 Hi,

 I'm having troubles lately with a Sieve script of mine:

 require "fileinto";
 require "mailbox";
 require "regex";

 if header :regex "Subject" "\\[.*PATCH.*\\]" {
 fileinto :create "Inbox.Patches";
 }

 This should move all patches with "[PATCH]" or "[RFC PATCH v3]" into
 this Inbox subfolder, I'm pretty sure this version worked flawlessly in
 the past but since a couple of weeks ago it's not working with some
 emails.

 Debugging this, with manually editing mail files, I came to this
 discovery.
 That one mail matches and it's getting moved to the correct folder:

 Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: qcm6490-shift-otter: A

 Adding one more character leads to it not getting moved:

 Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: qcm6490-shift-otter:
 Ad

 Does anybody have an explanation for this why this broke, and how to fix
 either Dovecot/Pigeonhole or my Sieve script?

 I've already lost hours trying to figure this out and I'm not getting
 any wiser...

 Regards
 Luca
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On 7. Dec 2025, at 13.44, Luca Weiss via dovecot <dovecot@dovecot.org> wrote:

Hi,

I'm having troubles lately with a Sieve script of mine:

require "fileinto"; require "mailbox"; require "regex";

if header :regex "Subject" "\\[.*PATCH.*\\]" { fileinto :create "Inbox.Patches"; }

This should move all patches with "[PATCH]" or "[RFC PATCH v3]" into this Inbox subfolder, I'm pretty sure this version worked flawlessly in the past but since a couple of weeks ago it's not working with some emails.

Debugging this, with manually editing mail files, I came to this discovery. That one mail matches and it's getting moved to the correct folder:

Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: qcm6490-shift-otter: A

Adding one more character leads to it not getting moved:

Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: qcm6490-shift-otter: Ad

Does anybody have an explanation for this why this broke, and how to fix either Dovecot/Pigeonhole or my Sieve script?

I've already lost hours trying to figure this out and I'm not getting any wiser...

Thanks, it was a bug in the new pcre2 code. Fix in the next version / https://github.com/dovecot/core/commit/d96c98e08ca0d445bd46192829685fbeaf401... & https://github.com/dovecot/core/commit/e704d9c72850684c1b82011c9550adbd4200f...

On 7. Dec 2025, at 13.44, Luca Weiss via dovecot <dovecot@dovecot.org> wrote:

 Hi,

 I'm having troubles lately with a Sieve script of mine:

    require "fileinto";
    require "mailbox";
    require "regex";

    if header :regex "Subject" "\\[.*PATCH.*\\]" {
        fileinto :create "Inbox.Patches";
    }

 This should move all patches with "[PATCH]" or "[RFC PATCH v3]" into
 this Inbox subfolder, I'm pretty sure this version worked flawlessly in
 the past but since a couple of weeks ago it's not working with some
 emails.

 Debugging this, with manually editing mail files, I came to this
 discovery.
 That one mail matches and it's getting moved to the correct folder:

    Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: qcm6490-shift-otter: A

 Adding one more character leads to it not getting moved:

    Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: qcm6490-shift-otter: Ad

 Does anybody have an explanation for this why this broke, and how to fix
 either Dovecot/Pigeonhole or my Sieve script?

 I've already lost hours trying to figure this out and I'm not getting
 any wiser...

Thanks, it was a bug in the new pcre2 code. Fix in the next version / [1]https://github.com/dovecot/core/commit/d96c98e08ca0d445bd46192829685fbeaf401... & [2]https://github.com/dovecot/core/commit/e704d9c72850684c1b82011c9550adbd4200f...

References

Visible links

1. https://github.com/dovecot/core/commit/d96c98e08ca0d445bd46192829685fbeaf401...
2. https://github.com/dovecot/core/commit/e704d9c72850684c1b82011c9550adbd4200f...