The $2 is filled repeatedly by ((?<=\\)"|[^"])+, and the last thing it matched was the o at the end of toto.

Also, it looks as if you are trying to parse quoted constructs. Have you considered what should happen for the following strings:

"Toto\"ro"
"Toto\\Africa"
"Toto\\"

[download]

Personally, I prefer the following approach for quoted constructs with backslash escaping instead of dealing lookbehind:

^"((?:[^"\]+|\\["\\]))"$

[download]

that is, "anything that is not a quote or a backslash", or "a backslash, followed by another backslash, or a quote"

In reply to Re: negative lookbehind and VERY strange capture by Corion
in thread negative lookbehind and VERY strange capture by Denis.Beurive

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