Search_Dict
Search::Dict, look - search for key in dictionary file
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use Search::Dict;
look *FILEHANDLE, $key, $dict, $fold;
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Sets file position in FILEHANDLE to be first line greater than or equal
(stringwise) to $key. Returns the new file position, or -1 if an error
occurs.
The flags specify dictionary order and case folding:
If $dict is true, search by dictionary order (ignore anything but word
characters and whitespace).
If $fold is true, ignore case.