摘要:
第二章language generated by regular expression is written as L(r).this language depends on the character set that is available. set elements arereffered as symbols. this set of legal symbols is called the alphabet and is usuallywritten as the Greek symbol ∑ sigma.2.2.1 definition of regular expressions 阅读全文
posted @ 2011-09-13 11:13
katago
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