Good AI Task

AI compatibility

Writing a ZIP code regex is exactly the kind of task AI nails every time.

Good fit

AI can handle this.

Average across 4 submissions.

96
avg / 100

The honest read

Writing a US ZIP code regex is a textbook coding task with fully deterministic success criteria — the pattern either matches the right inputs or it doesn't. AI agents handle this kind of well-scoped, verifiable code generation trivially well. There is essentially no human judgment required and the error cost is negligible.

Aggregated across 4 submissions.

The five dimensions

Repeatability

High

The task is structurally identical every time — a fixed format with two well-defined variants. No unique judgment is needed across instances.

Ambiguity Tolerance

High

Success criteria are completely crisp: match 5-digit ZIPs and optionally a hyphen plus 4 digits, reject everything else. A test suite can verify correctness mechanically.

Data & Tool Availability

High

The agent needs only its own knowledge of regex syntax — no external APIs, files, or permissions required. Everything needed is self-contained.

Error Cost

Low

A wrong regex is immediately testable and trivially correctable before deployment. No irreversible consequences exist at this stage.

Human Judgment Required

Low

There is no taste, ethics, or relationship context involved. The correct answer is objectively verifiable against a known format specification.

What an agent would need

  • Knowledge of regular expression syntax for the target language or flavor (e.g., Python, JavaScript, PCRE)
  • Understanding of the US ZIP+4 format specification (5 digits, optional hyphen, optional 4 digits)
  • Ability to produce a pattern that correctly anchors or scopes the match as needed
  • Optional: generate test cases to validate the regex against valid and invalid inputs

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Check a task

  • Write a regular expression that matches a US ZIP code, accepting both the 5-digit form and the optional 4-digit extension separated by a hyphen.

    97

  • Write a regular expression that matches a US ZIP code

    95

  • Write a regex that matches a US ZIP code with optional 4-digit extension

    97