title: Remove parts of columns values with regex
body: <p>I have a dataframe and in 2 columns i have to change values removing all that is not a number or ".". The final result should be only dotted numbers. thank you very much for those of you can help me. I attach how columns are<a href="https://i.stack.imgur.com/Tx3o6.png" rel="nofollow noreferrer">enter image description here</a></p>