Reviewer's Guide

Adjusts version parsing patterns and tests so that Windows Server-like platform_release strings (e.g. '2022Server') are rejected by default as invalid marker constraints but can be parsed when non‑PEP 440 parsing is explicitly requested, aligning behavior with existing non-standard versions like '4.9.253-tegra'.

Flow diagram for version parsing with updated release pattern

flowchart LR
    VersionString["Input version string"] --> ModeCheck{PEP440 parsing?}

    ModeCheck -- Yes --> Pep440Parser["PEP440Parser"]
    Pep440Parser --> Pep440Match{Matches PEP440?}
    Pep440Match -- Yes --> Pep440Valid["Accept version as valid PEP440"]
    Pep440Match -- No --> Pep440Invalid["Reject as invalid marker constraint (e.g. 2022Server)"]

    ModeCheck -- No (non PEP440) --> NonStandardParser["NonStandardVersionParser"]
    NonStandardParser --> ApplyPattern["Apply RELEASE_PATTERN with optional sign before build"]

    ApplyPattern --> ReleaseGroup["Match release group: [0-9]+(.[0-9]+)*"]
    ReleaseGroup --> OptionalBuild{Build part present?}

    OptionalBuild -- No --> NonPep440ValidRelease["Accept plain numeric releases"]

    OptionalBuild -- Yes --> BuildGroup["Match build group: [0-9a-zA-Z-]+(.[0-9a-zA-Z-]+)*"]
    BuildGroup --> SignOptional["Optional + or - before build (e.g. 4.9.253-tegra)"]
    SignOptional --> NonPep440Valid["Accept as valid non PEP440 version"]

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