Earnest Apathy

One of the things I love about jQueryUI is the fact that it can generate a download based upon one of several great-looking themes. This rolls up all the images and CSS into a single zip along with a customized JavaScript file. This is awesome, but what happens if I want to grab multiple themes, drop them into an ASP.Net website, and be able to switch between them?
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With the ideas, help, and suggestions of some very smart folks, I’ve been able to put together a userscript that displays whether jQuery is used on the current page—along with version—and can also load jQuery into the current page by clicking the indicator if jQuery is not already present.
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I had to search my desktop files and email history for forty minutes before I turned this up:

var rfc2822 =
/^[\w!#$%&'*+/=?^`{|}~-]+(?:\.[\w!#$%&'*+/=?^`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])*)+\.(?:[a-z]{2,4}|museum|travel)$/i;

That’s a JavaScript variable declaration, but the RegExp is valid for Perl and can be quickly translated for other languages.