比如有如下字符 text=cssPath:"http://imgcache.qq.com/ptlogin/v4/style/32",sig:"OvL7F1OQEojtPkn5x2xdj1*uYPm*H3mpaOf3rs2M",clientip:"82ee3af631dd6ffe",serverip:"",version:"201404010930"怎么提取元素为sig的值?就是OvL7F1OQEojtPkn5x2xdj1*uYPm*H3mpaOf3rs2M;
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