How to create a antlr4 grammar which will parse date

Question

I want to parse few date format using following ANTLR4 grammar.

grammar Variables;
//varTable : tableNameFormat dateFormat? ;
//tableNameFormat: (ID SEPERATO         


        

Answer 1

In my case it works. I am getting a correct parsetree with the input: 2016-01-01

grammar date;

dateFormat : year UNDERSCORE month UNDERSCORE today
       | year
       ;

year : DIGIT DIGIT DIGIT DIGIT
     ;

month : DIGIT DIGIT
      ;

today : DIGIT DIGIT 
      ;

UNDERSCORE: ('_' | '-' );
DIGIT : [0-9] ;

But I would use for month something like (0 [1-9] | 1 [0-2]) because there are only 12 months.