#regular language

Regular Language in Automata Thoery

Regular Languages or Formal Language : A language is regular if it can be expressed in terms of regular expression.

Closure Properties of Regular Languages

Union : If L1 and If L2 are two regular languages, their union L1 ∪ L2 will also be regular. For example, L1 = {an | n ≥ 0} and L2 = {bn | n ≥ 0} L3 = L1 ∪ L2 = {an ∪ bn | n ≥ 0} is also regular. Intersection : If L1 and If L2 are two regular…

What is Chomsky Hierarchy in Theory of Computation

What is Chomsky Hierarchy?

Noam Chomsky categorised regular and other languages which called as Chomsky Hierarchy.

Language Class Grammar Automaton 3 Regular NFA or DFA 2 Context-Free Push-Down Automaton 1 Context-Sensitive Linear-Bounded Automaton 0 Unrestricted (or Free) Turing Machine

This is a hierarchy, so every language of type 3 is also of types 2, 1 and 0; every language of…

Regular Expression Using Perl

Regular Expression Using Perl : Perl is the language that is the most famous for its use of regular expression for good reasons.

We use the =~ operator to denote a match or an assignment depending upon the context. The use of !~ is to reverse the sense of the match.

There are basically two regex operators in perl:

Matching: m//

Substitution: s///

The purpose of the // is to enclose the regex.…

Context free grammars (CFGs) are used to describe context-free languages. A context-free grammar is a set of recursive rules used to generate patterns of strings. A context-free grammar can describe all regular languages and more, but they cannot describe all possible languages.

Context-free grammars are studied in fields of theoretical computer science, compiler design, and linguistics. CFG’s…

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[ ] --> match against the set(s) specified within the square brackets 

+ --> the token before the plus must happen at least once

* --> the token before the asterisk can happen zero to n-times

\s --> denotes some kind of whitespace (matches against a `tab`, `space` or `newline` character)

() --> capturing group that takes a sequence of regex commands and makes them into one larger token

| --> equivalent to the boolean “or”

a-z --> the set of chars from lowercase a to lowercase z

A-Z --> the set of chars from uppercase A to uppercase Z

example:

[A-Z]+:( 0| 1)+\\s*;\\s*

this will match against a string that:

starts with at least one upper case letter(s), up to any number of them,

followed immediate by a colon character

followed by at least one ‘0′ or ‘1′ any number of times,

followed by any number of whitespace char(s) (at least zero),

followed by a semi-colon,

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