How to remove rows from a data frame that have special character (any character except alphabet and numbers)
I have some unwanted labels which seems to be useless but I want to remove them, this are in column[0] (labels) of my dataframe.
What is easiest way to remove the rows with special character in their label column (column[0]) (for instance: ab!, #, !d) from dataframe

For instance in 2d dataframe similar to below, I would like to delete the rows whose `column= label` contain some specific characters (such as blank, !, ", $, #NA, FG@)

[![example of dataframe](https://i.stack.imgur.com/PW06B.png)](https://i.stack.imgur.com/PW06B.png)