Rustom Mody writes: > On Wednesday, September 14, 2016 at 5:35:53 PM UTC+5:30, Jussi Piitulainen > wrote:
>> Mathematical discussions tend to acknowledge only alternation >> (union), concatenation and iteration (Kleene star) as operations, >> unless they specifically focus on some other operations that can, in >> principle, be expressed in terms of those three. There are many such. >> >> Without further regex operations it makes sense to include a special >> regular expression that matches nothing. Otherwise a very simple NFA >> (DFA) has no corresponding regex, which can be considered awkward. > > Not sure if I parse you correct — Assuming “a very simple DFA” you > mean “The DFA with only one state, no final state?” Yes. -- https://mail.python.org/mailman/listinfo/python-list
