@Makyen A normalized version,
{{'8777638488', '18777638488'}}
, of that pattern is already on the number blacklist. You can use
!!/bisect-number 877-763-8488
to determine which entries on the number lists match that pattern, which would tell you: Matched by
877-7638-488(?#IS NorAm)
on
line 971 of blacklisted_numbers.txt: 8777638488 found normalized