Kleene star
Kleene star (star closure; Kleene closure; iteration) An operation on formal languages that gives for any language L the language L*, defined by {Λ} ∪ L ∪ LL ∪ LLL ∪ …
where Λ is the empty word. Thus a word w is in L* if and only if it has the form w1w2…wn
with each wi in L, i.e. is a concatenation of words in L.
The Kleene-plus (L+) of L, is defined by L ∪ LL ∪ LLL ∪ …
Thus L+ comprises the nonempty strings of L*.
where Λ is the empty word. Thus a word w is in L* if and only if it has the form w1w2…wn
with each wi in L, i.e. is a concatenation of words in L.
The Kleene-plus (L+) of L, is defined by L ∪ LL ∪ LLL ∪ …
Thus L+ comprises the nonempty strings of L*.
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Kleene star