@JeffSchaller A normalized version,
{{'19438940'}}
, of that pattern is already on the number blacklist. You can use
!!/bisect-number 19438940
to determine which entries on the number lists match that pattern, which would tell you: Matched by
19438940(?#abuse the number blacklist for even more weight on persistent spam)
on
line 798 of blacklisted_numbers.txt: 19438940 found verbatim