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
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The Most Gender-Switched Names in US History
We use some names mostly for boys and some mostly for girls, but then there is a small percentage that, over time, switched from one gender to another. Which names made the biggest switch?
Most Common Use of Time, By Age and Sex
Typical time use varies by who you talk to. This interactive shows you the differences when you vary age and sex.