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I agree - it's up to you. I like to use cat to pipe everything to next command. The above command is the same as following:

sed -n -e 's/.*\([0-9]\{10\}\).*/\1/p' t1.txt t2.txt t3.txt t4.txt t5.txt

send the contents of the files (1 -5) to sed command for processing.

Try this:

your_variable=`cat t1.txt t2.txt t3.txt t4.txt t5.txt | sed -n -e 's/.*\([0-9]\{10\}\).*/\1/p'`