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Perl version of the same thing:
perl -pe 's/.*?"(.*?)".*?/\1 /g'

using Perl:-

perl -wlne 'printf "$1 " while (s/\"(.*?)\"//);' infile.txt

;););)

# echo '--yyy "test test2" sadasds --xxx "demo demo2"' | sed 's/.*-xxx \(.*\)/\1/'
"demo demo2"

# echo '--yyy "test test2" sadasds --xxx "demo demo2"' | sed 's/.*-xxx "\(.*\)"/\1/'
demo demo2

Assuming one --xxx per line, and that there might be text following the quoted string, this will work:


sed -r 's/.*--xxx[^"]*"//; s/".*//'

$ ruby -ne 'puts $_.scan(/\".[^"]*?\"/)' file
"test test2"
"demo demo2"



$ echo '--yyy "test test2" sadasds --xxx "demo demo2"' | ruby -e 'print gets.split("--xxx")[-1]'
"demo demo2"

sed 's/[^"]*"\([^"]*\)"[^"]*/\1 /g' infile

$ sed 's/\(.*\)\(\".*\"\)\(.*\)\(\".*\"\)/\2 \4/g;s/\"//g' file
test test2 demo demo2