class StringUtil {
  static bool isValidEmail(String email) {
    final regExp = RegExp(r'^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)*\.(\w+)$');
    return regExp.hasMatch(email);
  }
  
  static String truncate(String text, int maxLength) {
    if (text.length <= maxLength) return text;
    return '${text.substring(0, maxLength)}...';
  }
  
  static String formatDateTime(String dateTime) {
    try {
      final date = DateTime.parse(dateTime);
      return '${date.day}/${date.month}/${date.year} '
             '${date.hour}:${date.minute.toString().padLeft(2, '0')}';
    } catch (e) {
      return dateTime;
    }
  }
}