如何使用scrapy从python中的javascript onclick属性获取href值？

Question

<td class="headerStyle">
   <input type="image" 
       name="ctl00$ContentPlaceHolder1$gvfacletails$ctl19$lnkView" 
       id="lnkView" title="View" src="images/view.png" 
       onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$ContentPlaceHolder1$gvfaculetails$ctl19$lnkView", "", false, "", "viewculty.aspx?FacultyID=Li9S-20151", false, false))">
</td>

How to extract this href viewculty.aspx?FacultyID=Li9S-20151 from above javascript onclick in python using scrapy?

Answer 1

href = response.xpath('//input[@id="lnkView"]/@onclick').re_first( r'([^"]+\?[^"]+)' )

Above I'm using regex and searching for ? and surrounding unquoted symbols