I cannot regex for the life of me. Always have to Google to see if someone has written a regex that I need. 
As for fluency… it depends on your definition, I think. I can speak Spanish and French without going through a “translation” phase in my brain. I just speak it. But my French is pretty poor (I may not be “translating” but I often use the wrong words or verb tenses) and my Spanish is vocabulary-limited even though my fundamentals are strong.
But to make a short answer: English, Spanish, French