Date pattern railroad

Family: regex. Status: Implemented.

PlantUML regex block with named groups, character sets, repetition and a negative lookahead.

Scope: Static regex syntax diagram and structural exploration; no embedded regex execution engine.

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@startregex
title ISO date with optional time
(?<year>\d{4})-(?<month>0[1-9]|1[0-2])-(?<day>\d{2})(?:T\d{2}:\d{2})?(?!\d)
@endregex