Inspired from CASA Lib / AS 2.0 (v.10/06/08) - Aaron Clinger, David Nelson
under development...
contains -> Determines if string contains search string.
isEmail -> Determines if string is a valid email address.
isEmpty -> Determines if string is blank or contains only tabs, linefeeds, carriage returns and spaces.
isPhone -> Determines if numbers in string are equal to or greater than a valid phone number length.
isZip -> Determines if numbers in string are a valid US zip code length.
isCreditCard -> Determines if credit card is valid using the Luhn formula.