index.js

/**
 * @fileOverview Checks for presence of any Chinese text in a string.
 * @author Anton Ivanov <anton@ivanov.hk>
 */

/** Regex equivalent to \p{Han} in other programming languages. */
const HAN_REGEX = /[\u2E80-\u2E99\u2E9B-\u2EF3\u2F00-\u2FD5\u3005\u3007\u3021-\u3029\u3038-\u303B\u3400-\u4DB5\u4E00-\u9FD5\uF900-\uFA6D\uFA70-\uFAD9]/;

/**
 * Returns true if the `text` contains at least one Chinese characters;
 * false otherwise.
 * @param {string} text - The text to be checked for Chinese.
 * @returns {boolean}
 */
function containsChinese(text) {
  // Empty strings don't contain Chinese.
  if (text === null || text === undefined || text === '') { return false; }

  // If you passed a number or object, it's kind of OK too.
  if (typeof text !== 'string') text = text.toString();

  // Check for any match using regex; cast boolean
  return !!text.match(HAN_REGEX);
}

// Export regex as a static member in case someone needs it.
/** Regex equivalent to \p{Han} in other programming languages. */
containsChinese.HAN_REGEX = HAN_REGEX;

module.exports = containsChinese;