cake_wallet/lib/entities/emoji_string_extension.dart

import 'package:flutter/material.dart';

extension Emoji on String {
  static final REGEX_EMOJI = RegExp(
    r'[\u{1f300}-\u{1f5ff}\u{1f900}-\u{1f9ff}\u{1f600}-\u{1f64f}'
    r'\u{1f680}-\u{1f6ff}\u{2600}-\u{26ff}\u{2700}'
    r'-\u{27bf}\u{1f1e6}-\u{1f1ff}\u{1f191}-\u{1f251}'
    r'\u{1f004}\u{1f0cf}\u{1f170}-\u{1f171}\u{1f17e}'
    r'-\u{1f17f}\u{1f18e}\u{3030}\u{2b50}\u{2b55}'
    r'\u{2934}-\u{2935}\u{2b05}-\u{2b07}\u{2b1b}'
    r'-\u{2b1c}\u{3297}\u{3299}\u{303d}\u{00a9}'
    r'\u{00ae}\u{2122}\u{23f3}\u{24c2}\u{23e9}'
    r'-\u{23ef}\u{25b6}\u{23f8}-\u{23fa}\u{200d}]+',
    unicode: true,
  );

  bool _hasOnlyEmojis() {
    final parsedText = this.replaceAll(' ', '');
    for (final c in Characters(parsedText))
      if (!REGEX_EMOJI.hasMatch(c)) return false;
    return true;
  }
 /// Returns true if the given text contains only emojis.
  bool get hasOnlyEmojis => _hasOnlyEmojis();
}