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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Alternation (formal language theory) ： ウィキペディア英語版 Alternation (formal language theory) In formal language theory and pattern matching, alternation is the union of two sets of strings or patterns. As a pattern, the alternation of ''a'' and ''b'' matches either ''a'' or ''b''. In formal language theory, alternation is commutative and associative. This is not in general true in pattern-matching languages. In the SNOBOL language, regular expression syntax, and some other languages, alternation is a binary infix operator on patterns, notated "|". ==References== * John E. Hopcroft and Jeffrey D. Ullman, ''Introduction to Automata Theory, Languages and Computation'', Addison-Wesley Publishing, Reading Massachusetts, 1979. ISBN 0-201-02988-X. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Alternation (formal language theory)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.