Useful regular expression tutorial

Is there a good tutorial on using regular expressions, especially with grep? I tried googling for some, but most tutorials are too basic and cover things I already know.

Answers has a tutorial section. This site is pretty comprehensive for regular expressions in general, although the emphasis is on support in scripting and programming languages.

The J. Friedl book, (mentioned previously), is definitely an outstanding resource, and essential reading if you are serious about doing what the title says. If you're just in it for a I'm-in-a-hurry quick-online-scan, then you might want to try the link above, or just hit up a search engine and browse around.

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Centered and fixed navigation

css menu navigation fixed

I have the css below, which makes my navigation bar be centered.

R: Import data from multiple file paths and store in a list

r list import

I have some data which I would like to read in from seperate .txt files based on individual paths. A sample folder structure with txt files can be downloaded here.

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