instead of multiple String Manipulation Nodes you could also use the new Column Expressions Node that provides all functions of the String Manipulation Node.
Edit: Sorry I misread the post. The thing you could do is to write your expression and copy it for all columns, which is somehow tedious but maybe a bit better than using several String Manipulation nodes.
What you can do to make it easier is to use your functions of a variable (say ‘col’) and in the first row assing ‘col’ the specified column. For example:
col = column(0)
Then you would have to change only the first line for each column, which pays of if you have a complex function reusing the same column over and over again.