Regex to remove numbers but keep numbers that are combined with a hyphen

Question

I need to write a regex pattern that will remove everything from my text except letters, hyphen (-), slash (/) (e.g., '[^a-zA-Z-/]') and numbers in combination with a hyphen ('5-', '-123'). Single numbers or numbers in combination with other characters should be removed, so '9-SomeWord', 'SomeWord-34' must be kept, but '456ml', '23' or '56%' should be removed.

What should be the regex pattern?

Answer 1

Try

r'[^\w/-]+|_|(?<![\d-])\d+(?!\d*-)'

See regex101 for testing and further details.