LLM classification vs regex routing: precision at the edges decides it.

LLM classification vs regex routing: precision at the edges decides it.

SCOOP: teams are swapping rule-based routing (keyword match, regex) for an LLM that 'reads' the message and tags intent. The LLM handles fuzzy language regex never could. But it costs per call, adds latency, and occasionally hallucinates a category that doesn't exist.

The sane division:
— Clean, structured input with known patterns (order IDs, status codes): regex, instant and free.
— Free-text from humans (support tickets, replies): LLM, with a strict allow-list of output labels.

Never let the model invent its own categories. Constrain the output or it'll route to chaos. Watch this.