Hi everyone,
i've started to read the lex and yacc book and the bison and flex book.
now in the first example they have the following code:
%{
/**
* First example program for flex
*
*/
%}
%%
is |
am |
are |
where |
was |
be |
being |
been |
do |
does |
did |
should |
can |
could |
has |
have |
had |
go { printf("%s is a verb\n", yytext); }
[a-zA-Z]+ { printf("%s is not a verb", yytext); }
.|\n { ECHO; /* normal default anyway */ }
%%
int main(int argc, char **argv)
{
yylex();
}
Now my question is when i enter one of the verbs it's working normaly
like expected, but when i enter for example 234someword i also get the
messsage %s is not a verb but i've no rule saying that, i've only
[a-zA-Z]+ to catch this situation, why does he also react on word that
begin with a number ??
best regards!
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