semver

The semantic versioner for npm.

Usage

$ npm install semver

semver.valid('1.2.3') // true
semver.valid('a.b.c') // false
semver.satisfies('1.2.3', '1.x || >=2.5.0 || 5.0.0 - 7.2.3') // true
semver.gt('1.2.3', '9.8.7') // false
semver.lt('1.2.3', '9.8.7') // true

As a command-line utility:

$ semver -h

Usage: semver -v <version> [-r <range>]
Test if version(s) satisfy the supplied range(s),
and sort them.

Multiple versions or ranges may be supplied.

Program exits successfully if all versions satisfy all
ranges and are valid, and prints all satisfying versions.
If no versions are valid, or ranges are not satisfied,
then exits failure.

Versions are printed in ascending order, so supplying
multiple versions to the utility will just sort them.