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itchyny/re.js

Created March 24, 2020 08:27
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re.js
const opt = (s) => `${group(s)}?`;
const chars = (s) => `[${s}]`;
const group = (s) => /^\[[^\]]+\][*+]$/.test(s) ? s : `(?:${s})`;
const or = (...xs) => xs.join('|');
const many = (s) => group(`${s}*`);
const many1 = (s) => group(`${s}+`);
const integer = or('0', `[1-9]${many('[0-9]')}`);
const name = (n, s) => `(?<${n}>${s})`;
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