%{
/*
 * This sample flex specification demonstrates very simple recognition.
 * It distinguishes between verbs and non-verbs.
 */
%}
%%

[\t ]+  ;  // ignore white space.

is |
am |
are |
were |
was |
be |
being |
been |
do |
does |
did |
will |
would |
should |
can |
could |
has |
have |
had |
go          { printf("%s: is a verb\n", yytext); }

[a-zA-Z]+   { printf("%s: is not a verb\n", yytext); }

. | \n      { ECHO; /* normal default anyway */ }

%%

main()
{
   yylex();
}