Regex to remove letters, symbols except numbers

Question

How can you remove letters, symbols such as ∞§¶•ªºº«≥≤÷ but leaving plain numbers 0-9, I want to be able to not allow letters or certain symbols in an input fie

Answer 1

If you want to keep only numbers then use /[^0-9]+/ instead of /[^a-zA-Z]+/