Steps to reproduce:
1-In English Wikipedia, try entering "son" (including quotes) in the search box in [[Special:Allpages]] (see URL).
2-Quotes will be converted to "
3-Click on the Go button again. " will be converted to " and an error message appears saying that: The given page title is invalid...etc
Version: 1.13.x
Severity: enhancement
URL: http://en.wikipedia.org/w/index.php?title=Special%3AAllPages&from=%22son%22&namespace=0