[antlr-interest] How exclude a symbol from lexer rule?

[Sergiy Karpenko]

Hi, all    
For axample we have a lexer rule:    
    
CHAR : ('a'..'z')|('0'..'9');    
    
But, I want exclude from this sequence 'k' symbol.     
Somethig like    
EXTCHAR: CHAR ~'k' ;    
    
Thanks    
  
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