:contains() edge case throwing an error

[Motty]

As I said, this is probably an edge case but this error doesn't occur in jQuery versions prior to 1.8.

When I use the contains selector to try and target an element containing a position selector text like this:

$('li:contains("\:first")');

I get an error:

Uncaught Error: Syntax error, unrecognized expression: :contains(" jquery-1.8.0.js:4512

Here is ​a demo which works fine in older versions of jQuery.

[Timmy Willison]

This was fixed by the all-encompassing ​https://github.com/jquery/sizzle/commit/6b8b9bf6b051de462972b8e4df1a7bdc91f17bfa