The problem is that mostly (.*?) makes backtrack a lot. After studying for more than a week, I came to the conclusion that the best approach to avoid the backtracking (in my cases) is using atomic group ?> (which once matched what is inside it, does not backtrack) and possessive quantifier.

I succesfully managed using atomic group and possessive quantifiers in lots of my regex and it indeed helped a ton! But in the case above, I still cant find how possessive can help. I could, for example, use possessive quantifier to change from:

id="email"[^>]*?>(.*?)