Regular Expressions and an MVC introduction

This morning, upon reading my RSS feeds, I came across two interesting and very useful posts.  The first titled "MVC anatomy for PHP developers" is a great introduction as to why the model, view, controller design is good and is really meant for people just beginning out with PHP or have never used the MVC design before.  The post doesn't go into much depth, but it does cover that first step.

The next post I came across was "15 PHP regular expressions for web development." This post goes across some basics of regular expressions but then goes on to list some very useful and commonly used ones.  There are a couple strictly WordPress regular expressions in there, but most of them are universal.