/ab(?=.{1})$/g
doesn't match "abdabd" or anything else
It's the anchor $ that is troubling me. What can this regex match ?
What can this regex match ?
This regex won't match anything and is guaranteed to fail because:
ab - will literally match ab
(?=.{1}) - will use lookup to make sure there is at least 1 character after ab
$ - will assert end of input after ab
both conditions can never be met hence your regex will always fail.
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