def initialize(term)
literal_string = ""
regexp_string = ""
index = 0
while index < term.length
if term[index] == '*'
regexp_string << "#{WORD_CHARACTER}*"
literal_string = nil
index += 1
elsif term[index] == '?'
regexp_string << WORD_CHARACTER
literal_string = nil
index += 1
elsif term[index] == '~'
raise "~ unsupported"
else
if term[index] == '\'
index = index+1
if index >= term.length
raise "Backslash at end of string '#{term}'"
end
end
literal_string << term[index] if literal_string
regexp_string << Regexp.escape(term[index])
index += 1
end
end
super(regexp_string, literal_string)
end