diff --git a/src/detectors/regex.ts b/src/detectors/regex.ts
index 9773a1e..10d0d1b 100644
--- a/src/detectors/regex.ts
+++ b/src/detectors/regex.ts
@@ -90,7 +90,7 @@ const RULES: RegexRule[] = [
   // ── Reference Number (keyword-triggered) ───────────────
   {
     type: "reference",
-    pattern: /\b(?:Referenz|Ref\.|Kunden(?:-?nummer)?|Kd\.-Nr\.|Vorgangs(?:-?nummer)?|Rechnungs(?:-?nummer)?|RG\.-Nr\.|Auftrags(?:-?nummer)?|Beleg(?:-?nummer)?|Ticket(?:-?nummer)?|Fall(?:-?nummer)?)\b\s*[:#]?\s*([A-Z0-9][\-A-Z0-9\/]{2,40})\b/gi,
+    pattern: /\b(?i:Referenz|Ref\.|Kunden(?:-?nummer)?|Kd\.-Nr\.|Vorgangs(?:-?nummer)?|Rechnungs(?:-?nummer)?|RG\.-Nr\.|Auftrags(?:-?nummer)?|Beleg(?:-?nummer)?|Ticket(?:-?nummer)?|Fall(?:-?nummer)?)\b\s*[:#]?\s*([A-Z0-9][\-A-Z0-9\/]{2,40})\b/g,
     label: "REFERENCE",
     priority: 8,
   },
diff --git a/test/regex-detector.test.ts b/test/regex-detector.test.ts
index 9755a9c..2ecd884 100644
--- a/test/regex-detector.test.ts
+++ b/test/regex-detector.test.ts
@@ -237,4 +237,20 @@ describe("RegexDetector", () => {
     expect(emails[0].replacement).toBe("<EMAIL_1>");
     expect(emails[1].replacement).toBe("<EMAIL_2>");
   });
+
+  // ── English/Tech Word False-Positive Regression (#35)
+  it("does NOT detect common English/tech words as PII", () => {
+    const safeWords = [
+      "ticket", "chat", "teams", "fallback", "reference",
+      "account", "key", "case", "id", "session", "message", "token",
+    ];
+    for (const word of safeWords) {
+      const matches = detector.detect(
+        `The ${word} was processed successfully.`
+      );
+      if (matches.length > 0) {
+        throw new Error(`Word "${word}" was falsely detected as PII: ${matches[0].type} (${matches[0].match})`);
+      }
+    }
+  });
 });