FastMail (via Nick Matsakis):
Our plan at FastMail is to detect iOS clients, and convert all searches into FUZZY searches. This causes matches to be done on “terms” rather than pure sub-strings, but allows us to use our xapian powered index which should make matching and fetching results much, much quicker.
I wonder why MobileMail is using a body substring search to begin with. The Mac version only supports term and prefix searches. (I think a previous version may have supported wildcards.) EagleFiler offers the option to “Match Partial Words” or not.
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