string-parameter-pattern-required

Requires string parameters and direct component-schema string properties to define a non-blank pattern or format.

Attribute	Value
Category	Security
Maturity	Gold
Lenient–Strict	Warning
Complete	Error

See it fail

- in: query
  name: countryCode
  schema: { type: string }

Fix it

- in: query
  name: countryCode
  schema: { type: string, pattern: '^[A-Z]{2}$' }

Query, path, header, and cookie parameters are checked.

Nearby: parameter-length-required, string-schema-length.