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## Summary When the uv version is read from dependencies (`requirements.txt`, or `project.dependencies` / `optional-dependencies` / `dependency-groups` in `pyproject.toml` via `version-file`), the specifier was matched with `/^uv([=<>~!]+\S*)/`. PEP 508 allows whitespace around operators and after commas, and those valid forms were misread: | dependency | before | after | |---|---|---| | `uv >= 0.5.0` | not found, latest uv installed | `>=0.5.0` | | `uv == 0.11.20` | not found, latest uv installed | `==0.11.20` | | `uv>=0.5.0, <0.6.0` | `>=0.5.0,`, fails with `No version found for >=0.5.0,` | `>=0.5.0,<0.6.0` | The regex now allows whitespace around operators and between comma-separated clauses, and strips it from the result. Inputs that worked before give the same result, including inline `--hash=` options, trailing ` # comments`, the `\` continuation lines from `uv pip compile --generate-hashes`, and names that only start with `uv` (`uvicorn`, `uv-build`). ## Test plan - Added cases for spaced operators, spaced clauses, inline `--hash` and trailing comments. The four whitespace cases failed before the change. - `npm run all` on Ubuntu (WSL) with Node 24.19.0: build, Biome (no fixes), packaging, and 165 tests across 15 suites pass. The rebuilt `dist/setup/index.cjs` only differs in the changed line. --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>