| constant::= string | integer | float | boolean | uuid | blob | NULL | |
| string::= ''' (any character where ' can appear if doubled)+ ''' : '$$' (any character other than '$$') '$$' | |
| integer::= re('-?[0-9]+') | |
| float::= re('-?[0-9]+(.[0-9]*)?([eE][+-]?[0-9+])?') | NAN | INFINITY | |
| boolean::= TRUE | FALSE | |
| uuid::= hex\{8}-hex\{4}-hex\{4}-hex\{4}-hex\{12} | |
| hex::= re("[0-9a-fA-F]") | |
| blob::= '0' ('x' | 'X') hex+ |