Let's say that I want to match "beer", but don't care about case sensitivity.
Currently I am defining a token to be ('b'|'B' 'e'|'E' 'e'|'E' 'r'|'R') but I have a lot of such and don't really want to handle 'verilythisisaverylongtokenindeedomyyesitis'.
The antlr wiki seems to suggest that it can't be done (in antlr) ... but I just wondered if anyone had some clever tricks ...
How about define a lexer token for each permissible identifier character, then construct the parser token as a series of those?
beer: B E E R;
A : 'A'|'a';
B: 'B'|'b';
etc.