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Description

Quantifiers "*", "+", and "?" are special cases of the bracket notation. "*" is equivalent to {0,} (Case 1, Case 2), "+" to {1,} (Case 3, Case 4), and "?" to {0,1} (Case 5, Case 6).

Source

AA ABA ABBA ABBBA

Case 1

Regular Expression: AB*A
First match:AA ABA ABBA ABBBA
All matches:AA ABA ABBA ABBBA

Case 2

Regular Expression: AB{0,}A
First match:AA ABA ABBA ABBBA
All matches:AA ABA ABBA ABBBA

Case 3

Regular Expression: AB+A
First match:AA ABA ABBA ABBBA
All matches:AA ABA ABBA ABBBA

Case 4

Regular Expression: AB{1,}A
First match:AA ABA ABBA ABBBA
All matches:AA ABA ABBA ABBBA

Case 5

Regular Expression: AB?A
First match:AA ABA ABBA ABBBA
All matches:AA ABA ABBA ABBBA

Case 6

Regular Expression: AB{0,1}A
First match:AA ABA ABBA ABBBA
All matches:AA ABA ABBA ABBBA