Question

I have a xml file with a 1 line long string
I want to extract the number after “”
like the following example, I want to get 131

.....<yt:duration seconds='131'/>....

the “….” here means the substrings before and after “”, which are long with different characters, numbers and marks.

how to use sed for extracting the matching number?
thanks

Answer 1

Use grep, not sed:

grep -o "<yt:duration seconds='[0-9]\+'/>" file.txt | cut -f2 -d"'"