Regular Expression Matching can be Ugly and Slow

If you open the first few pages of O'Reilly's Beautiful Code, you will find a well written chapter by Brian Kernighan (Personal motto: "No, I didn't invent C. Who told you that?"). The non-C inventing professor describes how a limited form of regular expressions can be implemented elegantly in only a few lines of C code.

A simple command line calculator

A textbook example of recursive descent parsing.

Finding great ideas for your startup

"I just don't have any ideas." This is the #1 stumbling block for budding entrepreneurs. Here are a few techniques to get the creative juices flowing.

qb.js: An implementation of QBASIC in Javascript

Play NIBBLES.BAS in your browser. I re-implemented a small part of QBASIC as a compiler in Javascript, so it runs in a webpage.

Finding Bieber: On removing duplicates from a set of documents

Using a locality sensitive hash, you can mark duplicates in millions of items in no time.

How wide should you make your web page?

Based on 22500 unique IP addresses over the past week.

Comment spam defeated at last

For years when running this blog, I would have to log in each day and delete a dozen comments due to spam. This was a chore, and I tried many ways to stem the tide.

Give your Commodore 64 new life with an SD card reader

Dust off your old Commodore 64, and you could be the coolest kid on the block by plugging SD cards into it instead of floppies.

Is 2009 the year of Linux malware?

Is 2009 the year of the linux desktop malware? How long until we see headlines like, "Researchers find massive botnet based on linux 2.30"?

How to detect if an object has been garbage collected in Javascript

If you are writing an application in Javascript, soon you will have to worry about memory leaks. But it is difficult to even know if a memory leak exists. This handy method can help.