more..

server/utils/vocabularyAuditFilters.ts

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+const escapeRegex = (value: string): string => value.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+
+const parseOptionalPositiveInt = (value: unknown, fieldName: string) => {
+  const raw = String(value ?? '').trim();
+  if (!raw) return { value: undefined as number | undefined };
+
+  if (!/^\d+$/.test(raw)) {
+    return { error: `${fieldName}必须是正整数` };
+  }
+
+  const parsed = Number(raw);
+  if (!Number.isFinite(parsed) || parsed <= 0) {
+    return { error: `${fieldName}必须大于0` };
+  }
+
+  return { value: parsed };
+};
+
+export const buildVocabularySummaryFilters = (query: Record<string, any>) => {
+  const studentNo = String(query.studentNo || '').trim();
+  const rawMinCorrectWords = query.minCorrectWords ?? query.minWords;
+  const wordCountResult = parseOptionalPositiveInt(rawMinCorrectWords, '正确单词数量');
+  if ('error' in wordCountResult) return { error: wordCountResult.error };
+
+  const minCorrectWords = wordCountResult.value;
+  const userMatchStages = studentNo
+    ? [{
+      $match: {
+        'user.username': {
+          $regex: escapeRegex(studentNo),
+          $options: 'i'
+        }
+      }
+    }]
+    : [];
+
+  const baseMatch: Record<string, any> = {};
+  if (typeof minCorrectWords === 'number') {
+    baseMatch['stats.correctWords'] = { $gte: minCorrectWords };
+  }
+
+  return {
+    minCorrectWords,
+    userMatchStages,
+    baseMatch
+  };
+};