Question

I’m trying to insert an absolute path before all images in an HTML file, like this:

<img src="/media/some_path/some_image.png"> to <img src="{ABS_PATH}/some_path/some_image.png">

I tried the following regex to identify the lines :

egrep '(src|href)="/media([^"]*)"'

I want to use sed to make these changes, but the above regexp doesn’t work, any hints?

 sed 's#(src|href)="/media([^"]*)"##g'

sed: -e expression #1, char 32: unknown option to `s’

EDIT:
ok, now i have:

echo 'src="/media/some_image.png"' | "egrep -o '(src|href)="/media([^"]*)"' | sed 's/(src|href)=\"\/media([^"]*)\"//g'

Sed should match the string, but it doesn’t

Answer 1

1. sed doesn’t understand ERE (extended regular expressions), only BRE (basic regular expressions). GNU sed has “-r” option which turn on ERE.

2. You should change delimiters for regular expressions, because you have slash in the regex, like this:

   sed -r 's#(src|href)="/media([^"]*)"##g'
   

You can use almost any punctuation for delimiters.