can't get it to ignore some text

[rmichelena]

I'm watching a page with tenders, and they have a "countdown" feature that I want to ignore.
The unwanted "change notifications" I'm getting are like this:

(changed)             27-Jun-2025 16:00 (GMT -4.00) Expires within 1 days
(into)             27-Jun-2025 16:00 (GMT -4.00) Expires within 24 hours
(changed)             30-Jun-2025 23:59 (GMT -4.00) Expires within 5 days
(into)             30-Jun-2025 23:59 (GMT -4.00) Expires within 4 days
(changed)             03-Jul-2025 17:00 (GMT -4.00)
(into)             03-Jul-2025 17:00 (GMT -4.00) Expires within 6 days

So, it's fetched with Playwright, and in "Filters and Triggers" I put this in the "Ignore Lines Containing" section:
/.Expires within./

To no avail. I keep getting this notitifications (I also first tried just "Expires within" plainly without the regex, didn't work either).
I don't understand what am I doing wrong. Supposedly a line such as "27-Jun-2025 16:00 (GMT -4.00) Expires within 1 days" would match the expression, and then the whole line would be ignored/removed... as per the description of that field says "Each line processed separately, any line matching will be ignored (removed before creating the checksum)"