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copied!<p>You can read about regexes in <em><a href="http://books.google.com/books?id=dlzthEZGkmsC&pg=PA477#v=onepage&q&f=false" rel="nofollow noreferrer">An Introduction to Language And Linguistics By Ralph W. Fasold, Jeff Connor-Linton P.477</a></em></p> <p><strong>Chomsky Hierarchy</strong>:</p> <p>Type0 >= Type1 >= Type2 >= Type3</p> <p>Computational Linguistics mainly features Type 2 & 3 Grammars</p> <p>• <em>Type 3 grammars</em>:</p> <p>–Include <strong>regular expressions</strong> and finite state automata (aka, finite state machines)</p> <p>–The focal point of the rest of this talk</p> <p>• <em>Type 2 grammars</em>:</p> <p>–Commonly used for natural language parsers</p> <p>–Used to model syntactic structure in many linguistic theories (often supplemented by other mechanisms)</p> <p>–We will play a key roll in the next talk on parsing.</p> <hr> <p>most XMLs like <a href="http://en.wikipedia.org/wiki/DGML" rel="nofollow noreferrer">Microsoft DGML</a> (Directed Graph Markup Language) that has inter-relational links are samples that Regex are useless.</p> <hr> <p>and this three answers may be useful:</p> <p>1 - <a href="https://stackoverflow.com/questions/2974210/does-lookaround-affect-which-languages-can-be-matched-by-regular-expressions/2991587#2991587">does-lookaround-affect-which-languages-can-be-matched-by-regular-expressions</a></p> <p>2 - <a href="https://cstheory.stackexchange.com/questions/448/regular-expressions-arent">regular-expressions-arent</a></p> <p>3 - <a href="https://cstheory.stackexchange.com/questions/1047/where-do-most-regex-implementations-fall-on-the-complexity-scale">where-do-most-regex-implementations-fall-on-the-complexity-scale</a></p>

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