How to disambiguate 'true variables' from 'false variables'? $19.95USD -> not a variable, a price $e1p_zE@z -> not a variable, a suggested user-password Micro$oft -> not a variable, a common company name $$$CASH$$$ -> not a variable, a common spam subject line How to handle common scenarios that always come up? # A variable whose value is contingent on another variable # A variable that appears inside of a loop # A variable that should have some 'default' fill in value if the user-supplied value is left blank # A sample code-snippet that should appear inside the HTML and not be messed with or interpolated AT ALL