@minan I have built a workflow where you would load your data and you have a table with a list of special characters to remove. You can edit that.
The loop will automatically create a RegEx code that will remove the special characters in a multi column string manipulation node. In this case:
regexReplace($$CURRENTCOLUMN$$,"[%§/\\)]","")
The result is shown with the original table and the changed on. But you can of course just replace the table once you are confident your setup does what you want:
RegEx remove Collection of Characters from multiple Columns.knwf (124.5 KB)