I'm trying to filter some semi-constant noise from the subject fields of mail

items in a subfolder, but I can't get my filter to work. Clearly, I'm doing

something fundamentally wrong, but I can't see what.

Here are some examples of Subject fields:

SUSE-SU-2026:0245-1: Security update for php7

openSUSE-SU-2026:10079-1: python311-weasyprint-68.0-1.1 on GA media

and here is the filter that doesn't work (quoted to show where there are

spaces):

"(open)?SUSE-SU-[0-9]{4,4}: ?[0-9]{1,5}-[0-9]{1,2}: "

which kregexp interprets as:

Repeated at Most 1 Time: "open"

"SUSE-SU-"

Repeated Exactly 4 Times:

One of the following Characters: from 0 to 9

":"

Repeated at Most 1 Time: " "

Repeated From 1 to 5 Times:

One of the following Characters: from 0 to 9

"- "

Repeated From 1 to 2 Times:

One of the following Characters: from 0 to 9

": "

What am I overlooking/misunderstanding here?

Leslie