Learning regular expressions tends to involve a lot of trial and error and can be confusing for newcomers. RegExr is an online tool that lets you learn more interactively. Add a body of text in one area and type various regular expressions in another. Matches are highlighted and errors are noted on the fly, which is kind of perfect. Even if you aren’t new to regular expressions, this is worth bookmarking for later.
Learn regular expressions with RegExr
Projects by Nathan Yau See All →
Least Preferred Sandwich
Which sandwich do people not like the most? The winner: the Cheese and Tomato, if that even counts as an actual sandwich.
Americans are Growing Bigger
We keep getting bigger. Watch overweight and obesity rates move up over several decades.
EGOT Winner Timelines
Only 15 people have done it, since you know, it’s not really easy to do. Here’s how and when they did it.