antlr-font-lock-literal-regexp

antlr-font-lock-literal-regexp is a variable defined in `antlr-mode.el'.
Its value is

"\"\\(\\sw\\(\\sw\\|-\\)*\\)\""

Documentation:
Regexp matching literals with special syntax highlighting, or nil.
If nil, there is no special syntax highlighting for some literals.
Otherwise, it should be a regular expression which must contain a regexp
group. The string matched by the first group is highlighted with
`antlr-font-lock-literal-face'.

You can customize this variable.