Unexpected end of input when using uppercase letter

[mbatchkarov]

Hi,

I noticed a weird corner case when using uppercase letters in a regex. The following example parses fine:

final String grammar =
        "/nlp/\n" +
                "sent <- goo* name goo*\n" +
                "name <- 'Miro' \n" +
                "goo <- [0-9] / [a-z]/ ' '\n"; // adding  "/ [A-Z]" here breaks it

String txt = "hello Miro how are you";
try (GramExp peg = new GramExp(grammar)) {
    System.out.println(peg.parse(txt));
}

whereas the next two examples fail. I am only adding support for uppercase letters:

final String grammar =
        "/nlp/\n" +
                "sent <- goo* name goo*\n" +
                "name <- 'Miro' \n" +
                "goo <- [0-9] / [A-Z]/ ' '\n"; // adding  "/ [A-Z]" here breaks it

String txt = "HELLO MIRO HOW ARE YOU";
try (GramExp peg = new GramExp(grammar)) {
    System.out.println(peg.parse(txt));
}

and

final String grammar =
        "/nlp/\n" +
                "sent <- goo* name goo*\n" +
                "name <- 'Miro' \n" +
                "goo <- [0-9] / [a-zA-Z]/ ' '\n"; // adding  "/ [A-Z]" here breaks it

String txt = "hello Miro How are you";
try (GramExp peg = new GramExp(grammar)) {
    System.out.println(peg.parse(txt));
}

The error is:
Exception in thread "main" uk.ac.susx.tag.gramexp.GrammarException: Unexpected end of input, expected goo or name (line 1, pos 23)