[Flex-help] A question about flex

[ch2003 <ch...@gm...>]

Hi,

I am studying lexical analysis currently.

I am very interested in flex and I need your help.

It is said that a regular expression can be transformed into a DFA directly
in Section 2.9 of the dragon book.

However, in flex, a regular expression is transformed into a NFA, and then
the NFA is changed into DFA.

I want to know why transform the regular expression into a DFA directly in
flex.

Thank you very much.

Best regards

ch2003