Semantic versioning regex

^([0-9]+)\.([0-9]+)\.([0-9]+)(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+[0-9A-Za-z-]+)?$

example

http://regexr.com/3er1i

also see

• Semantic versioning http://semver.org/
• Source of the regex https://github.com/npm/node-semver/issues/32