Environment details

• Operating System+version: macOS
• Compiler+version: N/A
• Conan version: 2.0.17
• Python version: 3.12

Steps to reproduce

1. Create a package using a version number where the prerelease segment makes use of uppercase characters, such as 1.2.3-SNAPSHOT.
2. Attempt to run conan create for this package.
3. Observe that the recipe fails to export, due to the error raised at https://github.com/conan-io/conan/blob/07d49a5a0db6821d3664f40b0cc83cfe3812b73e/conans/model/recipe_ref.py#L131.

According to the semver 2.0 standard, uppercase characters should be allowed in the prerelease segment.

Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]

According to Conan documentation, Conan supports version numbers that are a superset of the semver specification: https://docs.conan.io/2.0/tutorial/versioning/version_ranges.html#semantic-versioning

However, the documentation for the version attribute at https://docs.conan.io/2.0/reference/conanfile/attributes.html#version indicates that it has the same restriction as name, and name only supports lowercase.

Is Conan intended to support semver and allow uppercase in prerelease version numbers? If it is, there is a bug in the check for uppercase on the entire package reference instead of just the name field. If it is not, there is a bug in the documentation that suggests that Conan supports semver-style prereleases, and the content at https://docs.conan.io/2.0/tutorial/versioning/version_ranges.html#semantic-versioning should be amended to make this limitation clear.

Logs

> conan create conanfile.py

======== Exporting recipe to the cache ========
ERROR: Conan packages names 'foo/1.2.3-SNAPSHOT' must be all lowercase