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Two questions have identical titles:

Regex expression using word boundary for matching alphanumeric and non alphanumeric characters in javascript

The URL's are also identical: http://stackoverflow.com/questions/4215468/regex-expression-using-word-boundary-for-matching-alphanumeric-and-non-alphanume and
http://stackoverflow.com/questions/4214204/regex-expression-using-word-boundary-for-matching-alphanumeric-and-non-alphanume Well, not quite! They have different numeric identifiers, at least I assume that is the purpose of the number in the URL. Note also that the question content in both is similar in meaning, although not identically worded. Why isn't this a bug?
EDIT #1
I just noticed that the questions were merged. However they both were displayed in a list of similar questions, one beneath the other, on a recent regex question (sorry, I should have taken a screen shot).

If questions have been merged, should they still display separately in the related question column?

EDIT #2 Sorry it took so long. And kind of fuzzy! an example of merged files still appearing

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3  
This is when you flag the question as a duplicate. –  Simon Sheehan Feb 28 '12 at 22:55
    
"not quite identical" == different, doesn't it? –  vascowhite Feb 28 '12 at 22:57
4  
I'm pretty sure the system prevents duplicated titles now... It probably wouldn't let you finish editing them (if you tried) without changing the title to something unique. –  animuson Feb 28 '12 at 23:38
    
Yes, merged questions could possibly be displayed in a list of questions as two separate questions. –  Cody Gray Feb 29 '12 at 2:14
    
@animuson yes, duplicate titles are expressly forbidden now on any given SE site. One of those 'we should have thought of this 2 years ago' ideas.. –  Jeff Atwood Feb 29 '12 at 10:30
2  
As for your question in EDIT #2: the linked list is cached and only rebuilt when a question is edited, or every 30 days. (As an aside: please, one question per question in future posts, and don't be afraid to edit posts rather than just adding stuff!) –  Arjan Feb 29 '12 at 22:37

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