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Description

(?=<pattern>) will look ahead if the pattern exists, but will not include it in the hit.

Source

AAAX---aaax---111

Case 1

Regular Expression: \w+(?=X)
First match:AAAX---aaax---111
All matches:AAAX---aaax---111

Case 2

Regular Expression: \w+
First match:AAAX---aaax---111
All matches:AAAX---aaax---111

Case 3

Regular Expression: \w+(?=\w)
First match:AAAX---aaax---111
All matches:AAAX---aaax---111