What is Regular Expression? Properties of regular expression

Regular Expression : The language accepts by finite automata are easily described by simple expression called regular expression.

Regular expression operators are union , concatenation & closure/star.

Properties of regular expression : 

1. Faka Set is a regular expression & denotes the empty set.
2.  Epsilon  is regular expression & denotes the set {Epsilon} 
3.        For each a in . a is a regular expression & denotes the set {a}.If r & s are regular expressions denoting the language R & S. respectively, then (r+s). (rs) & (r*) are regular expressions that denotes the sets RUS, RS & R* respectively.

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