Regular expression to find unescaped double quotes in CSV file

Question

What would a regular expression be to find sets of 2 unescaped double quotes that are contained in columns set off by double quotes in a CSV file?

Not a matc

Answer 1

For single-line matches:

^("[^"]*"\s*,\s*)*"[^"]*""[^"]*"

or for multi-line:

(^|\r\n)("[^\r\n"]*"\s*,\s*)*"[^\r\n"]*""[^\r\n"]*"

Edit/Note: Depending on the regex engine used, you could use lookbehinds and other stuff to make the regex leaner. But this should work in most regex engines just fine.