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Approximate string Search

At times, we may want to search a large body of textual information for all words close to a given pattern. Consider the help function ? offered in Darwin (§[*]). This function displays the description lines for all routines which have a word close to your query. If you type
? square
you are given the description for the built-in Darwin function sqrt (amongst others). Darwin offers two routines to accomplish this type of query.


Gaston Gonnet