fix(backend): filter PEP 440 .dev versions in fuzzy version matching

[richardthe3rd]

Summary

• Fix VERSION_REGEX to filter PEP 440 .dev versions (e.g. 2026.3.3.162408.dev0) during fuzzy version matching
• The regex caught -dev (hyphen) but not .dev (dot), so dev versions incorrectly satisfied stable version requests
• One-character fix: -dev → [-\.]dev, matching the existing pattern for rc and pre

Test plan

• Unit test for VERSION_REGEX matching .dev versions
• E2E test with inline plugin verifying mise latest, mise install, and mise exec correctly distinguish stable from .dev versions
• Existing unit tests (390 passed)
• Existing e2e tests (test_latest, test_ls_remote) pass — no regressions

Fixes #8784

[gemini-code-assist]

Code Review

This pull request addresses an issue where PEP 440 '.dev' versions were not correctly filtered as pre-releases by updating the VERSION_REGEX to include dot-separated dev suffixes. The changes include a new E2E regression test and unit tests to verify the regex behavior. Feedback suggests simplifying the regex by removing unnecessary backslash escapes within character classes and eliminating redundant case-insensitive keywords like 'SNAPSHOT'.

[greptile-apps]

Greptile Summary

This PR fixes a one-character bug in VERSION_REGEX where .dev (dot-separated PEP 440 dev versions like 2026.3.3.162408.dev0) slipped through the pre-release filter because the old pattern only matched -dev (hyphen). The fix changes -dev to [-\\.]dev, which is consistent with the already-existing [-\\.]rc and [-\\.]pre patterns. A unit test and a mock-plugin E2E test are included.

Confidence Score: 5/5

Safe to merge — minimal, targeted regex fix with consistent pattern, good test coverage, and no regressions.

The change is a single-character fix that mirrors two already-correct patterns in the same regex. All assertion helpers used in the new E2E test exist in the harness. No P1 or P0 findings.

No files require special attention.

Important Files Changed

Filename	Overview
src/plugins/mod.rs	One-character fix in VERSION_REGEX: -dev → [-\\.]dev, mirroring the existing [-\\.]rc and [-\\.]pre patterns; new unit test covers both old and new cases.
e2e/backend/test_dev_version_filter	New E2E test using an inline mock asdf plugin; exercises mise latest, mise install, and mise exec for both stable and .dev versions. All assertion helpers used (assert, assert_contains, assert_not_contains, assert_empty) are defined in e2e/assert.sh.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["Version list from plugin\n(e.g. 2026.3.3, 2026.3.3.dev0, 2026.3.3.162408.dev0)"] --> B{VERSION_REGEX.is_match?}
    B -- "matches: -dev / .dev / .rc / .pre / -alpha / etc." --> C["Filtered out (pre-release)"]
    B -- "no match" --> D["Kept as stable candidate"]
    D --> E["Fuzzy version resolution\n(mise latest / mise install)"]
    E --> F["Returns highest stable version\ne.g. 2026.3.3"]

    style C fill:#f99,stroke:#c33
    style F fill:#9f9,stroke:#3c3

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_{Reviews (5): Last reviewed commit: "Merge branch 'main' into fix/dev-version..." | Re-trigger Greptile}