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SANGARRAMU S.K

When you're extending the Lexer, set the options as

caseSensitive=false;
caseSensitiveLiterals=false;

Here you must Put All Tokens in LowerCase. EX:

tokens
	{	
		ROSE="rose";
				
	}

class lexerclass extends Lexer;

	
options {
caseSensitive=false;
caseSensitiveLiterals=false;
}

by
SANGARRAMU.
KAASHYAP RADIANT SYSTEMS LTD,
SANKARA TOWERS
119,RATHAKRISHNAN SALAI
CHENNAI-600004.
TAMILNADU.
INDIA.