Regex for escaping forward slashes and back slashes

Question

I need a regex that can match on forward slashes and back slashes so that I can escape them. However I don't want the regex to match on the following string:

\\\\"Hello World\\\\"

So for example

 / / ////////" \\\\\\\   \\\\"Hello World\\\\"

It should match on each slash EXCEPT where there are four slashes followed by a quote with any characters followed by another four quotes with a quote.

Answer 1

BP 120/30 I would like it to be escaped 120\\/30

Regex.Replace(subjectString, "(/{1})", @"\\$1");

Backslash example (BP 120\30):

Regex.Replace(subjectString, @"(\\{1})", @"\\\\$1");