MATLAB: Reformatting columns and rows of a table

MATLAB

Suppose I have a table

date NY Chicago SF
---------------------------
1/1/2020 10 15 20
1/2/2020 15  20 10

I want to reformat a table into the form

date city
-----------------------
1/1/2020 NY 10
1/2/2020 NY 15
1/1/2020 Chicago 15
1/2/2020 Chicago 20

Please advise.

Perhaps stack? Otherwise unstack? (Not clear on the result you want.)

The doc is your friend. You should really learn how to use it.

This example shows a simple way to add a new variable to a table: Calculate and Add Result as Table Variable

strrep is faster than regexprep:

a = '12/01/2011';
% Or a cell string also:
% a = {'12/01/2011', '12/01/2012'};
b = strrep(a, '/', '');