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Highlighting for Regex Group Pairings

I added a new feature where the respective group starting and ending will be highlighted in gray when the cursor is on either the start or end of the group.  This is especially useful when you have a large regular expression with many groups, or perhaps nested groups as below...



The idea for this comes right from Visual Studio 2010 which of course I use everyday.  And this feature is very responsive because of the fact that Regex Hero doesn't have to reparse anything when you're simply moving the cursor around.  Once again, the new parser is doing its job very well.

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