Extract url from a string with regex in shell script

Question

I need to extract a URL that is wrapped with <strong> tags. It's a simple regular expression, but I don't know how to do that in shell script. Here is example:

line="<strong>http://www.example.com/index.php</strong>"
url=$(echo $line | sed -n '/strong>(http:\/\/.+)<\/strong/p')

I need "http://www.example.com/index.php" in the $url variable.

Using busybox.

Answer 1

This might work:

url=$(echo $line | sed -r 's/<strong>([^<]+)<\/strong>/\1/')