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A new tag was added for asp.net+vb.net in StackOverflow. If you click on the link/tag, you don't actually see the correct results.

alt text

http://stackoverflow.com/questions/tagged/asp.net%2bvb.net

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Like that? I don't quite understand from your link – Earlz Mar 23 '10 at 15:47
4  
Wow, that is really broken. You can't add a "+" to the URL either, so how is it possible to find the question with that broken tag? – mmyers Mar 23 '10 at 15:47
    
I'm guessing this is true for other characters as well, just didn't try to find them... – RSolberg Mar 23 '10 at 15:53
    
@mmyers, I'm sure Jeff can just look in the database.. but this is definitely a bug – Earlz Mar 23 '10 at 15:53
    
there won't be many other characters that break like this; "+" is special to the URL syntax. note if it was "++" you could get the right tag; it's the single "+" that isn't working: stackoverflow.com/questions/tagged/asp.net%2b%2bvb.net – quack quixote Mar 23 '10 at 19:03
up vote 3 down vote accepted
 tags = Regex.Replace(tags, @"(?<=[0-9a-z])\+(?=[0-9a-z])",
       " ", RegexOptions.IgnoreCase);

Will be deployed later. For your viewing pleasure and my future reference, a list of all tags containing a plus:

++
a+
aac+
accelerated-c++
ajax+hebrew
alt+space
b+tree
blitz++
c++
c++0x
c++1x
c++builder
c++builder-2007
c++builder-2009
c++builder-2010
c++-builder-5
c++builder-5
c++builder-6
c++cli
c++-cli
c++-concepts
c++-faq
c++filt
c++-mode
c++-standard-library
c++-streams
c++test
c-c++-mixup
cc++usersjournal
checkbox+table
c-not-c++
cocoa+checkbox+tableview
column+name
com+
crypto++
c-vs-c++
dev-c++
effective-c++
flash+mysql+php
formview+mode
g++
gdi+
git+ssh
gtk+
hfs+
iphone+post
iphone+uiwebview
j++
java+smack+xmpp
jvm+msil
lapack++
lazy-c++
learning-c++
libstdc++
mac+setup
managed-c++
managed-c++opengl
modern-c++
msql-connector-c++
mysql++
n+1
n+1-selects-problem
notepad++
objective-c++
open-c++
php+javascript
php+regex
project+
py++
s+
spy++
ssl+python+stomp
svn+ssh
tinyxml++
to-be-wikified+1
turboc++
unittest++
unresolved-externals-c++
vc++
vc++.net
vc++6.0
vc++-project-file
visual+studio
visual-c++
visual-c++-2005
visual-c++-2008
visual-c++-2008-express
visual-c++-2010
visual-c++-redistributabl
windows-6+
x++
xl-c++
xml+flash+actionscript
xslt+excel
y2k+10

Just the problem tags

ajax+hebrew
asp.net+vb.net
b+tree
checkbox+table
cocoa+checkbox+tableview
column+name
flash+mysql+php
formview+mode
git+ssh
iphone+post
iphone+uiwebview
java+jsp
jvm+msil
mac+setup
n+1
php+javascript
php+regex
ssl+python+stomp
svn+ssh
to-be-wikified+1
visual+studio
xml+flash+actionscript
xslt+excel

Yes, some of these need to be fixed as well.. working on it. These should all be properly split now.

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