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for example, the regex [a-zA-Z] only cares about two kinds of characters: letters and everything else. so instead of individually taking derivatives for 52 alphabet characters a..z, A..Z, we can conclude from the start that there are only two kinds of characters we care about: letters ([a-zA-Z]) and non-letters ([^a-zA-Z]).
For many Americans, the number barely registers. But budget experts warn it represents one of the most consequential — and least discussed — fiscal emergencies in the country’s history.