FA-96799 / Phone number formatting / Member archive

Numbering prefix pattern classifier: a range overwrites an earlier matching literal in the same class · case 04

"5..." does not match "[50-3]X".

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
literal then range in one class	`"unknown"`	`"class-literal"`	Failed

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