[PDF] application of regular expression in theory of computation

Regular Expressions are useful for numerous practical day to day tasks that a data scientist encounters. They are used everywhere from data pre-processing to natural language processing, pattern matching, web scraping, data extraction and what not!
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  • What are the five applications of regular expressions?

    a*{?, a, aa, aaa …..}a+ b{a, b}a.b{ab}a* + ba{?, a, aa, aaa,…… , ba}

  • What are the properties of regular expression in theory of computation?

    A regular language is a language that can be expressed with a regular expression or a deterministic or non-deterministic finite automata or state machine.
    A language is a set of strings which are made up of characters from a specified alphabet, or set of symbols.

  • What is regular language in theory of computation?

    Ans.
    A regular expression can be defined as a language or string accepted by a finite automata.
    We know that a finite automata consists of five touples {Q, ?, ?, q0, F}.
    Among them a Regular Expression is a string on ?, i.e. it will consist only with input alphabets.
    In short a Regular Expression is written as RE.

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