@Cow A normalized version,
{{'8018555905', '18018555905'}}
, of that pattern is already on the number blacklist. You can use
!!/bisect-number 18018555905
to determine which entries on the number lists match that pattern, which would tell you: Matched by
18018555905
on
line 1948 of blacklisted_numbers.txt: 18018555905 found verbatim