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Added number of matches found and fixed a scrolling issue

I added a little text block above the target string that'll show you the number of matches found. So you'll notice that when you first bring it up with Regex Hero highlighted, it simply says, "1 match found." It's such a simple thing, but I thought knowing this number might be useful.

The next update is really a partial fix. Apparently there's a problem with the ScrollViewer in Silverlight 2.0 as documented here. Basically, when you try to put something extremely wide in the scroll viewer it'll all go crazy on you hiding and showing its contents sporadically. I fixed the problem by setting a max width on the text box of the target string. Unfortunately this means that the scroll bar won't take you to the very far left or right of extremely wide sections of text. You'll have to use your arrow keys for that. But it's better than what it was doing. Hopefully Silverlight 3.0 will solve this once and for all.

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