XPath expression to get the string following the open quote of an attribute?

"Roger L Costello [email protected]" <[email protected]> Thu, 14 Jan 2021 16:14:10 -0000
Newsgroups gmane.text.xml.xsl.general.mulberrytech
Message-ID <[email protected]>
Hi Folks,

Here are sample input strings:

="abc"
= "abc"
=       "abc"

That is, an equals, zero or more whitespaces, quote, value, quote

I want everything after the first quote. 

What XPath expression yields the desired result?

For all of the above inputs, the result of the XPath should be: abc"

/Roger
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