RegEx - Match Character only when it's not proceeded or followed by same character

Question

How would I match the quotations around "text" in the string below and not around "TEST TEXT" using RegEx. I wanted just quotations only when they are by themselves. I tried a negative lookahead (for a second quote) but it still captured the second of the two quotes around TEST TEXT.

This is some "text". This is also some ""TEST TEXT""

Be aware that I need this to scale so sometimes it would be right in the middle of a string so something like this:

/(\s|\w)(\")(?!")/g (using $2...)

Would work in this example but not if the string was:

This is some^"text".This is also some ""TEST TEXT""

I just need quotation marks by themselves.

EDIT

FYI, this needs to be Javascript RegEx so lookbehind would not be an option for me for this one.

Answer 1

Since you have not tagged any particular flavor of regex I am takig liberty of using lookbehind also. You can use:

(?<!")"(?!")[^"]*"

RegEx Demo

Update: For working with Javascript you can use this regex:

/""[^"]*""|(")([^"]*)(")/

And use captured group # 1 for your text.

RegEx Demo