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//define a lexical analyser called Example1
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lexer grammar Example1;
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OP : '+'| '*' | '-' | '/' ;
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DIGIT : [0-9] ;
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LPAR : '(' ;
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RPAR : ')' ;
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LETTER : [A-Za-z] ;
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ID : LETTER (LETTER | DIGIT)* ; // match idents
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WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines
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