* Name field only accepts alphanumeric values with space, dot, commas and dash.

* Subject field only accepts alphanumeric values with @, &, commas, space, underscore and dot. And Subject length should be in between 10 and 30.

* Comment field only accepts alphanumeric values with @, &, commas, space, underscore and dot. And Comment length should be in between 20 and 400.