In my program, I need a regx that says the format can be
Numeric only with this pattern: 1,3,56,8 or 2
In other words, if there's just one number it passes. However, if there are
2 or more they must be separated by a comma.
Basically (I know this doesn't work)
[0-9] or ([0-9], AND ^[a-zA-Z]