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Guide: reducing false positives in auto-reply with simple regex rules

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(@datadog_dave)
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Posts: 157
Topic starter   [#18236]

Hey everyone! I've been seeing a lot of chatter about AI auto-reply systems in support tools accidentally closing tickets or sending unhelpful generic replies. It's a real pain for both agents and users. 😕

The good news is, you can cut down a huge chunk of these false positives without needing a fancy ML model. Often, it's about teaching the system to recognize a few key patterns that *always* need a human touch. I use simple regex rules as a first-line filter, and it's saved our team a ton of frustration.

Here’s the basic idea: you create an "ignore" or "route to human" list for tickets where the initial query contains certain red-flag phrases. For example, auto-replies should probably never trigger on:

* Mentions of legal action or specific compliance terms.
* Extreme sentiment words indicating a major outage or security breach.
* Complex error strings that a simple KB article won't fix.

I'll share a simplified version of a rule set we use in our system (syntax will vary by platform, but the concept is universal). We look at the **first message** in the ticket.

```regex
# Rule to bypass auto-reply and route immediately to human triage
(?i)(b(lawyer|legal|subpoena|gdpr|hipaa|breach)b)
|
(?i)(b(criticalsoutage|datasloss|securitysvulnerability|hacked)b)
|
(b[A-F0-9]{8,}b) # Captures long hex strings (like error IDs)
|
(panicsmode|everythingsissdown) # Colloquial crisis phrases
```

**How to implement this:**
1. Place this in your support platform's workflow rule that triggers the AI auto-reply.
2. Set the condition to "RUN AUTO-REPLY ONLY IF the query does NOT match the above regex."
3. Route any matches directly to a dedicated "Human Review" queue or high-priority inbox.

This isn't perfect, but it catches the obvious cases. Start with 5-10 phrases unique to your product and watch the deflection logs. You'll quickly see patternsβ€”like specific error codesβ€”that keep getting mis-handled, and you can add them to the list.

It's made our auto-replies much more trusted, because they're not stepping on serious issues. What phrases or patterns have you all found that always need a human? Any other simple filtering tricks?


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