# `Replicant.Identifier`
[🔗](https://github.com/baselabs/replicant/blob/v0.3.1/lib/replicant/identifier.ex#L1)

Allowlist validation for Postgres identifiers `replicant` interpolates into slot
and publication SQL (Critical Rule 2). A failure carries the invalid-SHAPE fact
only, never the offending string — it may be attacker-controlled.

Mirrors `arcadic`'s `Identifier`, tightened to the Postgres unquoted-identifier
rule: lowercase letters, digits, underscore; first character a letter or
underscore; at most 63 characters (`NAMEDATALEN - 1`). Postgres folds unquoted
identifiers to lowercase and rejects the rest, so the allowlist accepts only
what Postgres accepts without quoting — nothing that can break out of the
identifier position.

# `validate`

```elixir
@spec validate(term()) :: :ok | {:error, :invalid_identifier}
```

Returns `:ok` for a valid identifier, `{:error, :invalid_identifier}` otherwise.

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*Consult [api-reference.md](api-reference.md) for complete listing*