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 FlowingData See All →
About 18 percent of couple households are single-income. I wanted to know what the earner in these homes usually do.
Income Taxes You Would Pay in Each State
Some states have high rates. Some have low. But whether a state is lower or higher for you depends on more than just the high brackets.