this cannot be empty
this must be an integer (-1,0,1,2,3, etc)
this must be numeric (0, 1.3, -5.2, 10, etc)
this must be between 3 and 6 characters long
this must be numbers only, but punctuation and spaces are ok
this must be only letters
this must be letters and/or numbers
this must be a date; try lots of combos
this must be an email address
this must be a url
this must be a dollar currency ($1.00, $1,000.00, $100)
this one of these must be checked
a: b: c:

single input test

this cannot be empty