This removes lines consisting entirely of digits while keeping lines that merely contain them.
The distinction that matters
2026 is removed. seo trends 2026 is kept. A filter for any digit would take both, which is usually not what a cleanup pass wants.
Where purely numeric lines come from
Column headers, row indices, page numbers, IDs and stray values that arrived when a copy-paste picked up more than intended.
A precision cleanup
This is the narrow version of digit filtering — it removes noise without touching the meaningful entries that happen to contain numbers.
Try it: Remove Lines That Are Only Numbers on SeoWolf's Notepad.