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Regular Expression s

Regular Expression s Are Used For Representing  Certain Sets Of Strings In A Algebraic Function.   Rules 1) Any Terminal Symbol i.e Symbols ε, Σ Including ∧(Empty) And Φ(Phi) Are Regular Expresions. Example:- Input Symbols Like a,b,1,0,∧,Φ Are Regular Expresions   2) The Union Of Two Regular Expresions Is Also A Regular Expresion. Example-R1,R2 (R1,R2) Is A Regular Expresion.   3) The Concatenation Of Two

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