Regex blocking syntax question

[KingZog]

Howdy!

I need to block an a set of images. In order to do this I need to check for the existence of the - character (minus sign). If the - character does not exist, then block the image.

For example:

http://abcde.com/[b]foo-bar.jpg[/b] would be ok, but

http://abcde.com/[b]foobar.jpg[/b] should be blocked.

I understand regex syntax and use, but I'm not sure how to translate that into this kind of filter. Can anyone tell me how to create that kind of filter?

Thanks!
King Zog