FA-96784 / Phone number formatting / Member archive

Numbering prefix pattern classifier: a number shorter than the pattern matches · case 04

"7" matches "7X".

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Input [number, rules] with rules [pattern, label] in priority order. Pattern characters: X any digit, [..] a class of single digits and inclusive ranges a-b, other characters literal. A pattern matches when each of its positions matches the corresponding number digit (the number may be longer). Score: literal digit 2, class 1, X 0; the highest score wins and ties keep the earlier rule. No match gives "unknown".

Why this case matters

Numbering-plan tables decide routing, rating and number type from prefixes; specificity and range errors misroute whole blocks of numbers.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
number shorter than the pattern	`"generic"`	`"unknown"`	Failed

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