# 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