Using Grep To Find or Match All Links in an HTML Document
egrep -or "(http(s)?://){1}[^'\"]+" path/to/directory
You can further reduce to just return the images by piping again.
grep -r src views/ | egrep -o "(mailto|ftp|http(s)?://){1}[^'\"]+"
The -r flag is for a recursive directory scan....
Written by Sean Behan on 09/15/2013