How to match zero or more with XPath?

I am using lxml with python as follows:

trs = doc.xpath("//div[@id='divGridData']/div[2]/table/tr")
if not trs:
    trs = doc.xpath("//div[@id='divGridData']/div[2]/table/tbody/tr")

So the problem is the tbody. I want to know if I can change the two XPath expressions into one with something like ? in regex.

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