Regular Expressions

One of my download post processing scripts uses regular expressions heavily. Every time I have to use regular expressions beyond the basics, I am forced to read the documentation of the application or programming language. I've resigned myself to the fact that I'll never be an expert. Of course, it doesn't help that grep, vim, Python, etc, each have a slightly different flavour in their regex syntax, which basically ensures you can never know them all. Sigh.