[antlr-interest] Ambiguous lexer rules

[Fs Cc]

Hi,

How can I resolve the ambiguous antlr3 lexer rules in following case:

xstr [aaa ----> A xstr whose value is '[aaa'
[aaa bbb ccc] ----> An array with 3 strings: 'aaa' 'bbb' 'ccc'

So I write following rules:
  STRING : ('a'..'z' | 'A'..'Z' | '0'..'9')+; # only contains digits and letters
  XSTRING : '\u0021'..'\u007e'+; # 0x21-0x7e are the readable ascii chars.

  xstr : 'xstr' (XSTRING | STRING);
  array : '[' STRING+ ']';

But the array rule doesn't work, because '[aaa' is treated as a XSTRING 
rather than '[' and 'aaa'.
How can I fix it?

Thanks,
Fussi