Regex 的 lookbehind 和 lookahead

const lookbehind = "abcbc".replace(/(?<=a)b/g, "0");
const lookahead = "ababc".replace(/b(?=c)/g, "0");
console.log(lookbehind, lookahead); // a0cbc aba0c

正则，look ahead，look behind，regex

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