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Regular Expression (RE) in TOC | Finite Automata| Regular language



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The language accepted by Finite Automata (FA) are represented by simple expression is called as
Regular Expression
.
Formal Definition of Regular Expression:
Let
Σ be a given alphabet. Then
1. 𝜙,𝜖, and 𝑎 ∈ Σ are all regular expression. These are called primitive regular expression.
2. If 𝑟1, 𝑟2 are regular expressions, then 𝑟1 + 𝑟2, 𝑟1. 𝑟2, 𝑟1∗
and ( 𝑟1) are also regular expressions.
3. A string is a regular expression if and only if it can be derived from the primitive regular
expression by a finite number of applications of the rules in (2).
Example of some Basic Regular expressions:

conversation of Regular Expression to Finite Automata
RE to NFA to DFA to MDFA
Obtained minimized DFA
-Obtained NDA
Obtained DFA

By @cseacademyahmadsir

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