soundex
An {algorithm} for encoding a word so that similar sounding words encode the same. The first letter is
copied unchanged then subsequent letters are encoded as
follows:
bfpv -> "1"
cgjkqsxz� -> "2"
dt -> "3"
l -> "4"
mn� -> "5"
r -> "6"
Other characters are ignored and repeated characters are
encoded as though they were a single character. Encoding
stops when the resulting string is four characters long,
adding trailing "0"s if it is shorter. For example, "SMITH"
or "SMYTHE" would both be encoded as "S530".
(1995-01-05)