@Cow A normalized version,
{{'6201154009'}}
, of that pattern is already on the number blacklist. You can use
!!/bisect-number 620-115~4009(?# no noram)
to determine which entries on the number lists match that pattern, which would tell you: Matched by
6201 154009
on
line 2948 of blacklisted_numbers.txt: 6201154009 found normalized