Part two of my regex guide was released as a shiney PDF. At the time I never created a PDF for part one. Sometime between then and now I created an updated PDF version of both, and they have been gathering metaphorical dust.
So, here is a PDF version of part 1, along with an updated version of part 2 (incorporating feedback form the comment section):
Remember: The guide isn't a guide on regex best practises; the examples used are purely to explain the regex syntax. I use examples like escaping MySQL parameters because this is something most programmers are familiar with - you should never use regex for this purpose outside a regex tutorial..