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I found a superfluous backslash symbol (\) before the comma symbol in my tag set emails from stackexchange.com. For example, one of the questions has the following title:

iPhone app's Core Data\, after upgrade to App Store?

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up vote 2 down vote accepted

Chalk another one up for regular expressions: we weren't backslash-escaping "-" in our regex for escaping markdown characters in question titles. This is fixed now.

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