how to add quotes in all columns fields in rapidminer

Hi @sgnarkhede2016,

You can use Generate Attributes operator for this task : 

In attached file, the process.

Regards,

Lionel

If you prefer regex you could also use Replace with replace what

^.*$ 

and replace by

"$0"

But why do you want the quotes inside RapidMiner, where they are not needed?  If it is merely to include in the file when exporting to another format, you have the option to put all nominal values inside quotes in operators such as "Write CSV".