val='100 0x20 105'

awk -F=  -v vals="$val" 'BEGIN {
   n = split(vals, w, /[ \t]+/)
   for (i=1; i<=n; i++)
      values[w[i]] = 1
}
/^\[group[0-9]+]$/ {
   if (n == found)
      print grp
   delete seen
   found = 0
   grp = $0
   gsub(/^\[group|\]$/, "", grp)
}
NF == 2 && values[$2] && !seen[$2]++ {
   found++
}
END {
   if (n == found)
      print grp
}'