@Makyen A normalized version,
{{'18562503447', '8562503447'}}
, of that pattern is already on the number watchlist. You can use
!!/bisect-number 1 856 250 3447
to determine which entries on the number lists match that pattern, which would tell you: Matched by
18562503447
on
line 2976 of watched_numbers.txt: 18562503447 found normalized; 8562503447 found normalized