So basically you are looking for foo=" and then want to take the next
characters that is then followed by " or the Quotes is only there for
the example. It that case you are looking for foo= and want the next
characters to then write to a data area. I don't think any generic
string command will do that. You will have to roll your own.
Looking for <string> where line contains foo="<string>"
STR=$(sed -n 's/foo="\(.*\)"/\1/p')
That will put the value in STR within your shell script... but not sure
how you would get it into a data area.
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