ANTLR Lexer rules in v4 Fragments
Example
Fragments are reusable parts of lexer rules which cannot match on their own - they need to be referenced from a lexer rule.
INTEGER: DIGIT+
| '0' [Xx] HEX_DIGIT+
;
fragment DIGIT: [0-9];
fragment HEX_DIGIT: [0-9A-Fa-f];
