What is the name of the program (online service) for processing text with structured data?

Question

Computer networks

Already found on the Internet, but the link was lost. I can not find.
The essence is simple - there is a text "1,2,3,4,5,6,7,8". It is entered into the program, column and row separators are specified.
And then you can use the built-in syntax of the variables $0, $1, etc. + auxiliary functions ala foreach.
At the output, the processed text with substituted variables and the desired values

Answer 1

Try Emaks.