[antlr-interest] quick reply needed - doubt

[send2jafer1]

 i am having a lot of parameters defined in the lexer , whose input 
accepts values .
        but one among the parameters should accept a string which may 
contain " alpha numeric characters along with a single white space in 
the input string which may come at any place in the string ( for eg 
in first , middle or last )"

       the parameter should accept the value only if it satisfies the 
above mentioned conditions otherwise it should throw an exception as 
 " invalid value for the parameter x ".

       i have tried hidden token stream also .but it throws errors.
if anybody knows the solution let me know.









 
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