| Class | Description | 
|---|---|
| RegexAnnotatedTypeFactory | Adds  Regexto the type of tree, in the following cases:Stringorcharliteral that is a valid regular expressionStringorchar) or two partial regular expression values that make a valid regular expression
       when concatenated. | 
| RegexChecker | A type-checker plug-in for the  Regexqualifier that finds syntactically invalid regular
 expressions. | 
| RegexTransfer | The transfer function for the Regex Checker. | 
| RegexVisitor | A type-checking visitor for the Regex type system. |