This will make parsing simple
Let's say we have token in DOM like
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="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" />
Idea is to put starting and ending text and parse text between so in this case left starting will be
name="__VIEWSTATE" id="__VIEWSTATE" value="
and right
"
This must give us token :)