Regex are difficult to understand

Question

too many. hmmmm

Answer 1

It's complex but poweful...
Don't try to understand all at once... this require time, and practice when really needed ( even if you can do without, some case are ery much easier and shorter to write, when you start to have some skills ) is greatly helpful to understand them on real problem to solve ;)

Answer 2

I'm sure you will learn it the fastest by using it.
Pythex is very good for learning and quickly testing your regex - http://pythex.org/

Answer 3

okay will try