regex - ANTLR match to end of input -

i'm trying match grammar entire string, , have error out if cannot consume entire input. basically, pseudo regex:

\whitespace*  [a-za-z]+  [-]?  [a-za-z]+ \whitespace* $ 

according this, eof should work. so, consider grammar:

start : chars eof       ;  chars : ('a'..'z')+       ; 

if set input "hello" in code:

        var ss = new antlr.runtime.antlrstringstream(input);         var lex = new autocompletelexer(ss);         var tokens = new commontokenstream(lex);         var parser = new autocompleteparser(tokens);         return (basetree)(parser.start().tree); 

i ast 2 children, hello , eof, expected. if set input "hello#", gives same tree, , doesn't complain hash @ all. i'm not sure i'm doing wrong.

i found problem, exceptions getting trapped lexer instead of propagating code. so, adding this:

class throwalllexer: querylexer {     public throwalllexer(icharstream input): base(input) { }     public override void  reporterror(recognitionexception e) {         throw e; } 

i proper exceptions, instead of having them swallowed.