filterin'

main.dart

void main() {
  final pairs = [
    'BTC/USDT',
    'BTCD/USDT',
    'BTC/USD',
    'USDT/BTC',
  ];

  final search = 'BTCUS';
  final r = search.replaceAll(' ', '').split('').join('.*?');
  final regexp = RegExp(r);

  final res = pairs.where(regexp.hasMatch).toList(growable: false);

  print(res.join('\n'));
}