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Description

Quantifiers specify how many times a character can occur. Star * (Case 1) matches zero or more times, plus + (Case 2) once or more times and question mark ? (Case 3) zero or once.

Source

aabc abc bc

Case 1

Regular Expression: a*b
First match:aabc abc bc
All matches:aabc abc bc

Case 2

Regular Expression: a+b
First match:aabc abc bc
All matches:aabc abc bc

Case 3

Regular Expression: a?b
First match:aabc abc bc
All matches:aabc abc bc