regex101 can get it, but not in Keyboard Maestro
https://regex101.com/r/y8Ayag/1
regex: (?:^|,)(?=[^"]|(")?)"?((?(1)(?:[^"]|"")|[^,"]))"?(?=,|$)
Content :
12312,2.99,AMO024,Title,"Description, more info",,123987564
123,2.99,AMO024,Title,"Description, more info",,123987564
"""test"" test","test""fdas""fdad",