You gents ever used Google or Bing? EVERY search site strips punctuations and stems the terms. Even Amazon, GoodReader and B&N do it. Thousands of sites that use Lucene, for example, do the same. It's the basics of IR.
And to answer your question: I copy/pasted the title of a book. It differed from the one inside of Calibre by a hyphen.
Calibre's search is not user friendly if you have to type in cryptic stuff like author:"=John Smith". And even then a hyphen or a comma or a semicolon or a period will trip you up so your point is quite pointless and doesn't solve the bigger issue.
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