How to grep for a URL in a file?

Question

For example, I have a huge HTML file that contains img URL: http://ex.example.com/hIh39j+ud9wr4/Uusfh.jpeg

I want to get this URL, assuming it\'s the only u

Answer 1

You missed the character class 0-9 (also useless use of cat):

grep -o 'http://ex[a-zA-Z.-]*/[a-zA-Z0-9+-]*/[a-zA-Z0-9.,-+]*' file.html

Slight improvement, use -i for case insensitivity and only match images .jpg or .jpeg.

grep -io 'http://ex[a-z.-]*/[a-z0-9+-]*/[a-z0-9.,-+]*[.jpe?g]' file.html

Or how about just:

grep -io 'http://ex.example.*[.jpe?g]' file.html