Simple regexes to handle device detection within varnish. Includes links to documentation and suggested implementations. Neat.
Enable case insensitive searching in less by type -i or launching less with the -i flag. Genius.
A great little tool. Give it a vaguely regex like pattern and it'll give you a list of all the possible words. Want 5 letter words ending in me or be, gotcha! Great for domain name inspiration. Output is scripting friendly plain text. :-)
Handy regular expression cheat sheet which explains all the major regex patterns.