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export default {
  /**
   * @param {string} string
   * @param {string} [validationMessage]
   * @returns {Promise<string | void>}
   */
  email: (string, validationMessage) => {
    return /^[a-zA-Z0-9.+_'-]+@[a-zA-Z0-9.-]+\.[a-zA-Z0-9-]+$/.test(string)
      ? Promise.resolve()
      : Promise.resolve(validationMessage || 'Invalid email address')
  },
  /**
   * @param {string} string
   * @param {string} [validationMessage]
   * @returns {Promise<string | void>}
   */
  url: (string, validationMessage) => {
    // taken from https://stackoverflow.com/a/3809435 with a small change from #1306 and #2013
    return /^https?:\/\/(www\.)?[-a-zA-Z0-9@:%._+~#=]{1,256}\.[a-z]{2,63}\b([-a-zA-Z0-9@:%_+.~#?&/=]*)$/.test(string)
      ? Promise.resolve()
      : Promise.resolve(validationMessage || 'Invalid URL')
  },
}