isOnlyEmoji function
Returns true if the given text contains only emojis and whitespace. Returns false if the text contains any non-emoji characters.
Implementation
bool isOnlyEmoji(String text) {
if (text.isEmpty) return false;
final trimmed = text.replaceAll(whitespaceRegex, '');
if (trimmed.isEmpty) return false;
return trimmed.replaceAll(emojiRegex, '').isEmpty;
}