正则表达式如何解决JavaScript中数据字段中带逗号的CSV字符串解析问题？

// Regex to validate a CSV string
const re_valid = /^\s*(?:'[^'\]*(?:\[\S\s][^'\]*)*'|"[^"\]*(?:\[\S\s][^"\]*)*"|[^,'"\s\]*(?:\s+[^,'"\s\]+)*)\s*(?:,\s*(?:'[^'\]*(?:\[\S\s][^'\]*)*'|"[^"\]*(?:\[\S\s][^"\]*)*"|[^,'"\s\]*(?:\s+[^,'"\s\]+)*)\s*)*$/

// Regex to parse one value from a valid CSV string
const re_value = /(?!\s*$)\s*(?:'([^'\]*(?:\[\S\s][^'\]*)*)'|"([^"\]*(?:\[\S\s][^"\]*)*)"|([^,'"\s\]*(?:\s+[^,'"\s\]+)*))\s*(?:,|$)/g

// Function to parse CSV string into array
const CSVtoArray = (text) => {
  // Validate CSV string
  if (!re_valid.test(text)) return null;

  const values = [];

  text.replace(re_value, (m0, m1, m2, m3) => {
    // Handle single-quoted values
    if (m1 !== undefined) values.push(m1.replace(/\'/g, "'"));

    // Handle double-quoted values
    else if (m2 !== undefined) values.push(m2.replace(/\"/g, '"'));

    // Handle unquoted values
    else if (m3 !== undefined) values.push(m3);

    return '';
  });

  // Handle special case of empty last value
  if (/,\s*$/.test(text)) values.push('');

  return values;
};

// Sample CSV string with commas in data
const csvString = "'string, with comma', 23, 'lala'";

// Parse the CSV string into an array of values
const values = CSVtoArray(csvString);

console.log(values); // ['string, with comma', '23', 'lala']