[antlr-interest] How to recognize a String

[Gabriel Miro]

Hello all!
I'm new to ANTLR and I'm trying to build a simple grammar that can recognize
strings like ('val'). I'm using ANTLRWORKS and it generates a rule for
string values with single quotes and I mapped the parenthesis to lexer
tokens:

RPAREN:'(';
LPAREN:')';
...
STRING
    :  '\'' ( ESC_SEQ | ~('\\'|'\'') )* '\''
    ;


Now, if I try to write the following:

rule : RPAREN STRING

and evaluate the input ('blah', I get an error in the interpreter. I have no
idea why, but I'm thinking the STRING rule is evaluating EOF and returning
an error.

Any ideas on how to make this work?

Regards,
Gabriel Miró
ANTLR Newbie