I am using an array to store some data (keys e.g 47975081_1215781266128), it can be assumed that it is key to other data.

I want extract data from a file based on a couple of keys (range) and store the resulting data in a variable using the following command:
sed -n '/47975081_1215781266128/,/42628155_1215781428374/p' test1.txt

In my script I build a sed command and write it to a temp file using the code below:
Range1="${keys[$i]}"
Range2="${keys[$i+1]}"
a="sed -n '/"
b="/,/"
c="/p'"
d=" test1.txt"
echo "$a$Range1$b$Range2$c$d" > temp.txt

This works ok, it writes the following string to the temp file:
sed -n '/08465696_1215781522540/,/70225547_1215781581748/p' test1.txt

Then I grep this file and assign the contents to a variable
sedcmd=$(grep sed temp.txt)

However, the string that is extracted has other characters attached, the grep extracts:
sed -n ''\''/08465696_1215781522540/,/70225547_1215781581748/p'\''' test1.txt

It has added: ''\' before the '/08465.... and \''' after the ....48/p'
Can someone please tell me why? and how I can extract exactly what is in the temp.txt file and run it.

Basically, I want to build a command, run it and assign the resulting contents to an array.