Demonstrate the use of lex predefined variables (yytext, yyleng, yyin) with the help of program

%{

#include<stdio.h>

%}

%%

[a-z]* printf("matched string %s and length is %d",yytext,yyleng);

.* printf("%s invalid",yytext);

%%

int yywrap()

{

return 1;

}

int main()

{

yylex();

return 0;

}

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