@VLAZ A normalized version,
{{'2871514846970'}}
, of that pattern is already on the number blacklist. You can use
!!/bisect-number 2871514846970
to determine which entries on the number lists match that pattern, which would tell you: Matched by
2871514846970
on
line 3507 of blacklisted_numbers.txt: 2871514846970 found verbatim