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It's a common saying in IT: "I had a problem and used regular expressions to solve it. Now I've two problems". We want to...

We start our new series with an informative HashSet puzzler. It's about a bug that gave us quite a headache since its root cause...

This is another episode on regular expression. This time we look at the worst regex you can possibly come up with and it is nasty and evil. And we’ll see that it is quite common.