Looking for a Lex/Yacc free ebook

I bought the O'Reilly book a few years ago. Now I am working overseas
for a while & don't want to buy it again.


Any good free ebooks on Lex/Yacc or FLex/Bison ?


(and - without starting a religious war - which of those pairs is
recommended?)


Thanks in advance


[I've never seen a particularly good free e-book on the topic, but you
can buy used copies of my actual paper book for $5. For lex vs. flex,
lex is dead and everyone uses flex. For yacc vs. bison, if you need
the extra stuff they've added to bison like GLR parsing, use it,
otherwise Berkeley Yacc is a lot smaller and simpler. -John]

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