% option noyywrap
%{
  int len=0;
  #include<stdio.h>
%}
 
// Rules to identify if a character apart from alphabets
// occurs in a string
 
%%
[a-zA-Z]+ {printf("No character other than alphabets");}
 
/* here . will match any other character than alphabets
 because alphabets are already matched above
 * will matches 0 or more characters in front of it.
*/
 
.* {printf("character other than alphabets present"); }
%%
 
// code section
 
int main()
 { 
  yylex();
  return 0;
 }
 

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