This class defines string patterns and rules that are used to do taint
checking for Skyview CGI calls.
A hash map of acceptable character patterns is created upon construction
and are matched against user input associated with each CGI parameter.
If the pattern for a CGI parameter is not found the input is checked
for characters that are not allowed. Some parameters such as survey
name are checked against a pattern of allowed characters and then
checked again to make sure certain sequences of allowed characters are