Find nested quotes with wildcards

[dum]

Hi guys! Please, consult me a bit. I need to change nested quotes and I want to find in my document all the cases in which there are two opening quotes in a row, without a closing quote between them.


So, I want to find cases like this:

«Bla bla «Bla bla»

but not like this

«Bla bla» «Bla bla»

My question is how to make it using wildcards? How to match any number of any characters except the one (» in my case)? Because if I write expression like this

«([!»]{1,})«

it does not work. My Word even says that it is incorrect. Thanks a lot in advance!