ch1-02.l

%{
/*
 * this sample demonstrates (very) simple recognition:
 * a verb/not a verb.
 */

%}
%%

[\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 */ }
%%

int main()
{
  yylex();
  return 0;
}

int yywrap()
{
  return 1;
}