social-app/apps/lib/shared/utils/validators.dart

class Validators {
  Validators._();

  static String? phone(String? value) {
    if (value == null || value.isEmpty) {
      return '请输入手机号';
    }
    final phoneRegex = RegExp(r'^\+861[3-9]\d{9}$');
    if (!phoneRegex.hasMatch(value)) {
      return '请输入有效的 +86 手机号';
    }
    return null;
  }

  static String? password(String? value) {
    if (value == null || value.isEmpty) {
      return '请输入密码';
    }
    if (value.length < 8) {
      return '密码至少需要8位';
    }
    return null;
  }

  static String? required(String? value, [String? fieldName]) {
    if (value == null || value.isEmpty) {
      return '请输入${fieldName ?? '内容'}';
    }
    return null;
  }

  static String? nickname(String? value) {
    if (value == null || value.isEmpty) {
      return '请输入昵称';
    }
    if (value.length < 2) {
      return '昵称至少需要2个字符';
    }
    return null;
  }
}