In Regex, what is the difference between (?! ^) \ G and \ G (?! ^)?

Question

Given these two regex:

(?!^)\G

and

\G(?!^)

What is the difference between a negative look after and before the \Ganchor?

Answer 1

Logically, they look the same. They are functionally equivalent. (?!^)and they \Gcheck two different conditions in the same place on the line, so there is no logical difference in the order in which the conditions are checked.

Conditions:

• (?!^)= "we are not at the beginning of the input line
• \G= "we are in the place where the previous match ended

, , ( ), . , , , \G, , "" .

Answer 2

, . ,

(?!^)

\G

, -,

• , .