FA-95883 / Postal address normalization / Member archive

Secondary unit extractor: a free-standing hash is not a designator · case 03

"21 OAK ST # 5" keeps the unit inside the street line.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Input one uppercase-able street line. Split on whitespace. A final token "#ID" (with at least one character after #) becomes unit "# ID". Otherwise, if at least three tokens exist and the second-to-last token is a designator (APARTMENT/APT->APT, SUITE/STE->STE, UNIT, FLOOR/FL->FL, #), the last token is its identifier. Return [street, unit] with unit "" when none is found.

Why this case matters

Separating the secondary unit from the street line decides whether two deliveries go to the same building and which unit receives them.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
separate hash token	`["23 MAPLE ST # 7", ""]`	`["23 MAPLE ST", "# 7"]`	Failed

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