October 2013
Intermediate to advanced
368 pages
9h 20m
English
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2.2 The Soundex Class
Searching is a common need in many applications. An effective search should find matches even if the user misspells words. Folks misspell my name in endless ways: Langer, Lang, Langur, Lange, and Lutefisk, to name a few. I’d prefer they find me regardless.
In this chapter, we will test-drive a Soundex class that can improve the search capability in an application. The long-standing Soundex algorithm encodes words into a letter plus three digits, mapping similarly sounding words to the same encoding. Here are the rules for Soundex, per Wikipedia:[4]
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Retain the first letter. Drop all other occurrences of a, e, i, o, u, y, h, w.
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Replace consonants with digits (after the first letter):
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b, f, p, v: 1
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