Validate the new Discord username

validate-discord-username.ts

/**
 * Validate Discord username according to the services's rules
 * @param username the user's username
 * @returns ```{ hasSuccessiveDots, isCaseSensitive, containsSpecialChars, breaksMinMaxLength }```
 * @summary It does not support the previews version: discordUSerName#1234
 * @see https://support.discord.com/hc/en-us/articles/12620128861463-New-Usernames-Display-Names
 */
export const validateDiscordUsername = (username: string) => {
  // The RegEx support this validation:
  // ^(?!.*[.]{2,})[a-zA-Z0-9_.]{2,32}$

  let hasSuccessiveDots = false;
  let isCaseSensitive = false;
  let containsSpecialChars = false;
  let breaksMinMaxLength = false;

  const _hasSuccessiveDots = new RegExp('^.*[.]{2,}$').test(username);
  const _isCaseSensitive = new RegExp('[A-Z]+').test(username);
  const _containsSpecialChars = new RegExp('[^A-Za-z0-9_.]').test(username);

  if (username.length < 2 || username.length > 32) breaksMinMaxLength = true;
  if (_hasSuccessiveDots) hasSuccessiveDots = true;
  if (_isCaseSensitive) isCaseSensitive = true;
  if (_containsSpecialChars) containsSpecialChars = true;

  return { hasSuccessiveDots, isCaseSensitive, containsSpecialChars, breaksMinMaxLength };
};