Regular Expressions | Examples of Regular Expression | Kleene Closure, Positive Closure | Lecture 15

Regular Expressions.
why we call regular expressions as Regular.
Examples of Regular Expressions for different string patterns.
Kleene Closure and Positive Closure.
More Examples of Regular Expressions, Lecture 21 - • ORing and Concatenatio...

[@namberdarfarm3417]

Mam first 14 questions are very well clear for me but I have doubt in example 15

[@TechiePetals]

try one more time.