Crate semver[][src]

Expand description


A parser and evaluator for Cargo’s flavor of Semantic Versioning.

Semantic Versioning (see is a guideline for how version numbers are assigned and incremented. It is widely followed within the Cargo/ ecosystem for Rust.


use semver::{BuildMetadata, Prerelease, Version, VersionReq};

fn main() {
    let req = VersionReq::parse(">=1.2.3, <1.8.0").unwrap();

    // Check whether this requirement matches version 1.2.3-alpha.1 (no)
    let version = Version {
        major: 1,
        minor: 2,
        patch: 3,
        pre: Prerelease::new("alpha.1").unwrap(),
        build: BuildMetadata::EMPTY,

    // Check whether it matches 1.3.0 (yes it does)
    let version = Version::parse("1.3.0").unwrap();

Scope of this crate

Besides Cargo, several other package ecosystems and package managers for other languages also use SemVer: RubyGems/Bundler for Ruby, npm for JavaScript, Composer for PHP, CocoaPods for Objective-C…

The semver crate is specifically intended to implement Cargo’s interpretation of Semantic Versioning.

Where the various tools differ in their interpretation or implementation of the spec, this crate follows the implementation choices made by Cargo. If you are operating on version numbers from some other package ecosystem, you will want to use a different semver library which is appropriate to that ecosystem.

The extent of Cargo’s SemVer support is documented in the Specifying Dependencies chapter of the Cargo reference.


Optional build metadata identifier. This comes after + in a SemVer version, as in 0.8.1+zstd.1.5.0.

A pair of comparison operator and partial version, such as >=1.2. Forms one piece of a VersionReq.

Error parsing a SemVer version or version requirement.

Optional pre-release identifier on a version string. This comes after - in a SemVer version, like 1.0.0-alpha.1

SemVer version as defined by

SemVer version requirement describing the intersection of some version comparators, such as >=1.2.3, <1.8.


SemVer comparison operator: =, >, >=, <, <=, ~, ^, *.