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Description

(?!<pattern>) will look ahead if the pattern exists. If it does there will be no hit.

Source

AAAX---AAA

Case 1

Regular Expression: AAA(?!X)
First match:AAAX---AAA
All matches:AAAX---AAA

Case 2

Regular Expression: AAA
First match:AAAX---AAA
All matches:AAAX---AAA