def GetMiddleStr(content,startStr,endStr):
    startIndex = content.index(startStr)
    if startIndex>=0:
        startIndex += len(startStr)
    endIndex = content.index(endStr)
    return content[startIndex:endIndex]

if __name__=='__main__':
    print(GetMiddleStr('<div class="a">sharejs.com</div>','<div class="a">','</div>'))


#//python/8476