I want to parse this with ANTLR4:

; this is a comment
dummykey=dummy string  100 #!; this is a comment
firstname=peter mike
name=mc miller

This is the grammar:

grammar KEYVALUE;

COMMENT: ';' .*? ('r'? 'n' | EOF) -> skip;

file: line* EOF;

line: Space* keyValuePair;

keyValuePair:
    key EQ value 
    {       
       String k = $key.text;
       String v = $value.text; 

       System.out.println("nkey   : `" + k + "`");
       System.out.println("value : `" + v + "`");
     };

key: AlphaNum+;

value: valueChar+ EOL;

valueChar: Char;

EOL: LineBreak | EOF;
EQ: '=';

LineBreak: 'r'? 'n' | 'r';
Space: ' ' | 't' | 'f';
AlphaNum: [a-zA-Z0-9];
Char: .; 

When i start it with: more test.txt |grun parser.KEYVALUE file -gui

I get these error messages and there are no values.

key : dummykey
value : “

line 2:14 mismatched input ‘ ‘ expecting {‘=’, AlphaNum}

line 2:21 mismatched input ‘ ‘ expecting {‘=’, AlphaNum}

line 2:26 mismatched input ‘ ‘ expecting {‘=’, AlphaNum}

line 2:27 extraneous input ‘#’ expecting {Space, AlphaNum}

line 3:10 mismatched input ‘p’ expecting Char

key : firstname
value : “

line 3:15 mismatched input ‘ ‘ expecting {‘=’, AlphaNum}

line 3:20 mismatched input ‘rn’ expecting {‘=’, AlphaNum}

line 4:5 mismatched input ‘m’ expecting Char

key : name
value : “

line 4:7 mismatched input ‘ ‘ expecting {‘=’, AlphaNum}

line 4:14 mismatched input ” expecting {‘=’, AlphaNum}