Function normalizeShortcode

desktop/src/shared/api/customEmoji.ts:51–55

(raw: string)

 * and lowercase. Returns null if the result is empty or has invalid chars.
 */
export function normalizeShortcode(raw: string): string | null {
  const stripped = raw.trim().replace(/^:+/, "").replace(/:+$/, "");
  const lower = stripped.toLowerCase();
  return SHORTCODE_RE.test(lower) ? lower : null;
}

/**
 * Suggest a valid custom-emoji shortcode from an uploaded filename.