# Checks if the main arguement is a a vaid expression for a discount.
# @param s A character string representing the main argument.
# @return The character string representing the result of the check.
is_discount <- function(d){
if(nchar(d) == 0)
return("<font size='4', color=\"#C65555\"><b>Failure at input for discount: Check for missing input or obvious errors</b></font>")
if(d != 'None' & !grepl('[0-9]?[0-9]%', d))
return("<font size='4', color=\"#C65555\"><b>Warning: If there is a discount, it should be indicated by the number of percentage followed by a % symbol (without space); otherwise, \'None\'</b></font>")
return('Pass')
}
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