[Clipart] Bug. strange searching

[chovynz]

I searched for b_w  to clear up some clipart that has colour, and is not 
supposed to be in this tag list.
http://www.openclipart.org/tags/b_w?page=4

I find this.
http://www.openclipart.org/detail/1942

When I remove the "bow" tag, it does not appear in the taglist page. 
When "bow" is a tag, the clipart does appear in the taglist page.

Does search count _ as "and other letters in between"?