There is a part of the regular expression that I don’t understand.

text: 123google

.*(?!google)

Why does ‘123Google’ match?

(.*)(?!google)

If it’s confirmed in the capture group, ‘.*’ It’s not “123”. It’s “123 google”.

Does it match because there is no “g” after “123google”?

Or is there another reason why I didn’t think about it?

That’s what I’m going to do ‘.*’ Does it always mean all strings before looking forward negatively?

(.*)(?=google)

In Positive Look Ahead, ‘.*’ matches ‘123’ rather than a full string.

(.*)(?!google)

In negative lookahead, why does .* match the entire string? What characters must precede the

look around expression?

d+(?!google)

Why is only ’12’ matched in ‘123google’?

(?!.*google)*

Why only the back “o o g l e” matches in “123google”?

I’d like to know the reason and the principle.

We look forward to hearing from you clearly to resolve your questions.