Regex Generator — illustrative example

INPUT
JavaScript pattern for exactly three uppercase ASCII letters followed by two digits.

RESULT
^[A-Z]{3}[0-9]{2}$ matches ABC12 and rejects AB12, abc12 and ABC123.

REVIEW
A regex needs both matching and nonmatching examples. Specify the runtime and whether the pattern must match a whole value or a substring.

This is a teaching example, not a live execution record.