Lex program to recognize identifiers in C (" ▪ It should start with either letter or underscore (_) sign. ▪ It should not contain special symbols. ")

%{

#include<stdio.h>

%}

%%

^[a-zA-Z_][_a-zA-Z0-9]+ {printf("Identifier\n");}

.* {printf("Not a Identifier\n");}

%%

main()

{

yylex();

}

ScreenShot: