^从行开始处匹配,$从行结束处开始匹配。A从字符串开始处匹配,Z从字符串结束处匹配。例如:("thisisnthetime",/^the/)=>thisisn<<the>>time("thisisnthetime",/is$/)=>this<<is>>nthetime("thisisnthetime",/Athis/)=><<this>>isnthetime("thisisnthetime",/Athe/)=>nomatch("thisisnthetime",/timeZ/)=>thisisnthe<<time>>("thisisnthetime",/timez/)=>thisisnthe<<time>>("thisisnthetime",/isZ/)=>nomatch("thisisnthetime",/isz/)=>nomatch
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