From Dynamically Typed:

Anyone with excess time and skill on their hands? Would be awesome to see a port of jslint to PHP (and Perl / Python / Ruby for that matter). There's probably some issues with multibyte strings to contend with but browsing the source it looks doable.

It would mean is tools like Simple Test could help validate Javascript on a page they're. Simple Test comes with it's own regex-based parsing tools, which I introduced briefly here. Whether regexes are the right way to go though is another question, bearing in mind character encoding issues.

For those that don't know, jslint takes a JavaScript source and scans it. If it finds a problem, it returns a message describing the problem and an approximate location within the source. The problem is not necessarily an error, although it often is. jslint looks at some style conventions as well as structural problems. It does not prove that your program is correct. It just provides another set of eyes to help spot problems.