Added word regexp option to option struct.
Added word regexp option to option struct.

monochromegane/the_platinum_searcher,cmars/tools,cmars/tools,yuya-takeyama/the_platinum_searcher,thomasf/the_platinum_searcher,syohex/the_platinum_searcher,DaSea/the_platinum_searcher,tw4452852/the_platinum_searcher,cmars/tools,cmars/tools,aeruder/the_platinum_searcher