lex_template.lex

%{
/* Definition Section */
/* You define certain variables in here which you might need to manipulate your code */
%}

%% 

/* Rules Section */
/* Pattern Actions begin */
/* This is a section where you define certain patterns of string (just like RegEx) */
/* Here's an example to identify digits: */

[0-9] {
  printf("Here, I found a number! It's %s\n", yytext);
}

%%
/* Finally the code section begins */
 int main() {
    yylex();
    /* Just a C Program function. You can do anything here */
 }