: match?( pattern: Regexp )  ->  Integer
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    ޥå顢ݥ󥿤Ͽʤ᤺˥ޥå
    ʬʸĹ֤ޤޥåʤä nil 
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        s = StringScanner.new('test string')
        p s.match?(/\w+/)   #=> 4
        p s.match?(/\w+/)   #=> 4
        p s.match?(/\s+/)   #=> nil

