jQuery - check minimum version

To check whether jQuery is loaded to the page and verify minimum version:

if (typeof jQuery == 'undefined' || 
   !/[1-9]\.[3-9].[1-9]/.test($.fn.jquery)
) {
    throw('jQuery version 1.3.1 or above is required');
}

The regular expression determines the required jQuery version - /[X-9]\.[Y-9].[Z-9]/.
For example, for 1.3.1 use /[1-9]\.[3-9].[1-9]/, for 1.2.3 use /[1-9]\.[2-9].[3-9]/ etc.