Some good resources that I used personally to get over the fear of Regex are:
1. Tutsplus tutorials. I don't remember exactly but I think they were by Jeffery way, have a look around that site and you might just find it. Think those tuts could date back 2-4 years from now.
2. regex101.com -> Great tool for testing out regular expressions. It's much better than doing it in PHP and trying to to see if it works or not.
Besides that all you need to be pro at regular expression is a lot of practice. Once you get a hang of it, you will always think why hadn't you figured them out before