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Kleene star
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text (Or "Kleene closure", named after Stephen Kleene) The
postfix "*" operator used in regular expressions,
Extended Backus-Naur Form, and similar formalisms to specify
a match for zero or more occurrences of the preceding
expression. For example, the regular expression "be*t" would
match the string "bt", "bet", "beet", "beeeeet", and so on.