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]).
i haven’t found an implementation of the first one. the second targets javascript and should be available in node/chromium at some point. running /(a+)*b$/.test("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaba") in my browser console still makes the fans spin for 10 seconds, so i’m fairly sure it hasn’t shipped yet. without implementations and benchmarks to compare against, i can only comment on the theoretical differences.
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He wrote his first hit song with his neighbour while still a teenager. Connie Francis recorded and released "Stupid Cupid" in 1958.
无论未来时代如何发展，微信家族群里的“99+未读”，都会永远留在乡村迁徙者的心里，成为他们与家乡、与亲人之间最珍贵的记忆，成为他们心灵迁徙路上最温暖的陪伴。